The Problem: Three Tools That Should Be One
Picture this. It is Tuesday morning. You are on the train to a client meeting that was rescheduled from 10:00 to 11:00 last Friday. You changed the time on your laptop calendar before you left the office. But when you check your phone on the way to the station, it still shows the original time. You arrive an hour early, sit in a coffee shop, and waste sixty minutes you could have spent on billable work.
Or this: a potential client phones your mobile. You spoke to them at a networking event two weeks ago and saved their details on your office desktop. But your phone does not have their contact card because your contacts only exist on one machine. The call goes unanswered because you do not recognise the number. By the time you get back to the office and piece together who called, they have already spoken to your competitor.
Or this: you send an important proposal from your laptop at 5pm. On the train home, you want to check whether the client has replied. You open the email app on your phone and find an empty inbox — because your phone is set up on a different connection and has not pulled down the latest messages. You spend fifteen minutes fiddling with settings, refreshing the app, and getting increasingly frustrated.
These are not edge cases. These are the everyday frustrations that small business owners experience when their email, calendar and contacts are not synchronised. And the root cause is almost always the same: the three tools that make up your daily communication — email, calendar and contacts — are being treated as separate, disconnected systems. They are not. They are three parts of the same communication engine, and they need to work together.
Research by McKinsey found that the average professional spends 28% of the working week managing email. When you add the time lost to calendar confusion, duplicate contact entries and manual data entry across devices, the true communication overhead is even higher. Proper synchronisation does not eliminate email, but it removes the friction that turns a productive tool into a daily frustration.
Most small businesses do not set out to have disconnected systems. It happens gradually. You start with a free email account on your phone. You add a laptop. You set up a work calendar on one device and a personal calendar on another. You save contacts wherever you happen to be at the time. Before long, your communication system is a patchwork of half-synced tools, each with its own version of the truth, and none of them talking to each other reliably.
The fix is not complicated. It does not require expensive software or a dedicated IT department. It requires one thing: the right synchronisation protocol connecting all your devices to a single source of truth. And that is what this article is about.
What Synchronisation Actually Means in Practice
Before we get into the technology, let us be very clear about what "synchronisation" means in the context of business email. It is not a vague promise. It is a set of specific, measurable outcomes that affect how you work every single day.
Push Email — Messages Appear Instantly on Every Device
When someone sends you an email, it should arrive on your phone, your laptop and your tablet at virtually the same moment. You should not have to open your email app and wait for it to "check" for new messages. You should not have to press a refresh button. The message should simply appear, accompanied by a notification, on whichever device you happen to be looking at.
This is called push email, and it is the difference between knowing about a time-sensitive message immediately and discovering it twenty minutes later when your app finally gets round to checking. For a business that deals with client enquiries, booking requests, or urgent supplier communications, those twenty minutes can be the difference between winning and losing a piece of work.
Calendar Sync — One Calendar, Every Device, Real Time
When you create a meeting on your phone at 8am while waiting for the kettle to boil, that meeting should appear on your laptop when you open it at 9am. When you accept a meeting invitation on your laptop, it should appear on your phone within seconds. When a colleague changes the time of a meeting, the updated time should appear on every device belonging to every attendee — automatically, without anyone having to forward a new invitation or manually update their diary.
True calendar synchronisation means there is one calendar — stored centrally on your email server — and every device displays the same, up-to-date version of it. There are no "laptop appointments" and "phone appointments." There are just appointments, and they live everywhere.
Contact Sync — Save Once, Access Everywhere
When you meet a new client and save their name, phone number and email address on your phone, that contact should be available on your laptop within seconds. When you update a supplier's postal address on your desktop, the change should appear on your phone immediately. When you add a note to a contact — "prefers email over phone, allergic to early morning meetings" — that note should be visible on every device.
Contact synchronisation eliminates the problem of contacts being trapped on a single device. It also eliminates duplicate entries — the creeping problem where the same person appears three times in your address book because you saved them separately on your phone, your laptop and your webmail.
Task Sync — Assign It, Track It, Complete It
Many businesses use email-based task management — assigning tasks to team members, setting due dates, tracking progress. When these tasks synchronise across devices, you can review your to-do list on the train, mark a task as complete on your phone after a meeting, and see the updated status on your laptop when you return to the office. Without sync, tasks exist only on the device where they were created, and keeping track of what has been done requires manual checking and constant cross-referencing.
Every epost.plus business email plan includes full synchronisation of email, calendar, contacts and tasks across all devices — as a standard feature, not a paid upgrade. You get one unified communication system that works the same way on your phone, laptop, tablet and webmail.
The Technology Behind It — Explained Simply
You do not need to understand the internal workings of email synchronisation to benefit from it. But knowing the basics helps you make an informed choice when selecting an email provider and setting up your devices. There are two main approaches, and the difference between them matters enormously.
ActiveSync — The Universal Translator
Think of ActiveSync as a universal translator that sits between your email server and all your devices. It speaks one language to the server and translates it into whatever your phone, laptop or tablet needs to understand. And it handles everything — email, calendar, contacts and tasks — through a single connection.
When you set up an ActiveSync account on your phone, you enter your email address and password once. The phone then connects to the server and begins synchronising all four services automatically. There is no need to configure email separately from calendar separately from contacts. One setup, everything works.
ActiveSync also operates in real time. When a new email arrives, the server pushes it to your device immediately. When you create a calendar event, the server distributes it to your other devices within seconds. This "push" model means your devices are always up to date without constantly checking for changes.
Beyond synchronisation, ActiveSync provides features that are particularly valuable for businesses:
- Remote wipe — If an employee loses their phone or a device is stolen, an administrator can remotely erase all business email, contacts and calendar data from the device. The data remains safe on the server, but the lost device no longer contains any sensitive business information.
- Security policies — Administrators can enforce security requirements on connected devices, such as requiring a PIN or password to unlock the phone, or requiring the device to encrypt its storage.
- Selective sync — Users can choose how much data to synchronise. For example, you might sync the last three months of email on your phone but keep the full archive available on your laptop.
IMAP — The Basic Alternative
IMAP (Internet Message Access Protocol) is the older, more basic approach to email synchronisation. It handles email — and email only. It does not synchronise calendars. It does not synchronise contacts. It does not synchronise tasks. If you want calendar sync with IMAP, you need to configure a separate protocol called CalDAV. For contacts, you need CardDAV. For tasks, you need yet another connection. Each one requires separate setup on each device.
IMAP also uses a polling model rather than a push model. Instead of the server telling your device when new email has arrived, your device periodically asks the server "is there anything new?" The frequency of these checks depends on your settings — typically every five, ten or fifteen minutes. This means there is always a delay between when an email arrives and when you see it on your device.
IMAP is perfectly adequate for personal email or for situations where you use only one device. But for a business that relies on multiple devices, shared calendars, and a central contact directory, IMAP creates exactly the kind of disconnected, fragmented experience described at the beginning of this article.
If your email provider only supports IMAP and not ActiveSync, your calendar and contacts will not synchronise automatically across devices. You will need to configure each service separately — and some devices and apps do not support the additional protocols (CalDAV/CardDAV) at all. Before choosing a provider, always check whether ActiveSync is included.
ActiveSync vs IMAP: A Clear Comparison
The difference between these two approaches is not subtle. It affects how you work every day. Here is a straightforward comparison:
| Feature | ActiveSync | IMAP |
|---|---|---|
| Email sync | Yes — push (instant) | Yes — polling (delayed) |
| Calendar sync | Yes — built in | No — requires separate CalDAV |
| Contact sync | Yes — built in | No — requires separate CardDAV |
| Task sync | Yes — built in | No — not supported |
| Setup complexity | One account setup | Multiple accounts and protocols |
| Remote wipe | Yes | No |
| Security policies | Yes — device PIN, encryption | No |
| Real-time delivery | Yes — push notification | Delayed — depends on polling interval |
| Best suited for | Businesses with multiple devices and team coordination | Single-device personal use |
The comparison is clear. For any business that uses more than one device — and in 2026, that means virtually every business — ActiveSync is the practical choice. IMAP is not broken, but it is a tool from an era when people read email on one computer and did not expect their calendar to follow them around.
The Real Productivity Impact
Synchronisation sounds like a technical feature. In practice, it is a productivity multiplier. Here is what changes when your email, calendar and contacts are properly synchronised.
No More Duplicate Entries
Without synchronisation, the same contact ends up saved on three different devices in three slightly different ways — "John Smith" on your phone, "J. Smith (Acme)" on your laptop, and "John S. — met at conference" on your tablet. When you search for John's phone number, you find three entries and are not sure which one is current. With synchronisation, there is one contact record. You update it once, and the update appears everywhere. No duplicates, no confusion, no wasted time cross-referencing.
No More "Which Device Has the Latest Version?"
When everything is synchronised, there is no concept of a "latest version." Every device shows the same data. The meeting you accepted on your phone is on your laptop. The email you filed into a folder on your laptop is filed on your phone. The contact you edited on your tablet is edited everywhere. You never have to wonder whether the information on the device in front of you is up to date, because it always is.
Fewer Mistakes, Fewer Missed Appointments
Calendar mix-ups are not just inconvenient — they cost money. A missed client meeting damages trust. A double-booked slot means letting someone down. A meeting that was moved but only updated on one device means someone turns up at the wrong time. Synchronised calendars are a single source of truth. When a meeting changes, the change is reflected everywhere, for everyone. The scope for human error is dramatically reduced.
Remote Wipe Protects Your Business
Smartphones get lost. They get stolen. They get left in taxis, coffee shops and airport lounges. Without ActiveSync, a lost phone potentially contains months of business emails, your entire contact database, and your complete appointment history — all accessible to whoever finds the device.
With ActiveSync, an administrator can send a remote wipe command to the lost device. All business data — emails, contacts, calendar entries, tasks — is erased from the phone. The data itself is perfectly safe, because it lives on the server. Once you get a replacement phone, you set up your account, and everything synchronises back within minutes.
According to a Kensington study, over 70 million smartphones are lost each year worldwide. For a UK small business, even one lost phone containing unsecured client data could result in a GDPR breach notification, reputational damage, and potential fines. Remote wipe capability is not a luxury — it is a basic security measure.
Team Coordination Without the Email Ping-Pong
Scheduling a meeting with three colleagues should not require six emails. With synchronised shared calendars, you can see when everyone is available, pick a slot, and send a single invitation. The meeting appears on everyone's calendar across all their devices. No "does 2pm work for you?" email chains. No "I think I'm free but let me check when I get back to my desk." Just one click, one invitation, done.
For businesses with field staff, sales teams, or employees who split their time between office and remote working, shared calendar visibility is transformative. Knowing where everyone is and when they are available — without making a phone call or sending a message — saves hours of coordination time every week.
Availability Checking and Meeting Scheduling
ActiveSync supports free/busy lookups, which means that when you create a meeting and add attendees, you can see whether they are free at the proposed time before you send the invitation. This simple feature eliminates the back-and-forth that plagues businesses without shared calendar infrastructure. You check availability, pick a free slot, and invite everyone — confident that the time works for all participants.
Which Email Providers Include ActiveSync?
Not all email providers are equal when it comes to synchronisation. Understanding what each type of provider offers helps you make the right choice for your business.
Generic Shared Hosting — Almost Never
If your email came bundled with your website hosting from a generic shared hosting provider, it almost certainly does not include ActiveSync. Shared hosting email typically supports IMAP and POP3 only. This means email synchronisation of a basic kind, but no calendar sync, no contact sync, and no task sync. You would need to configure CalDAV and CardDAV separately — and many shared hosting providers do not support these protocols either. For basic personal email this may be acceptable, but for a business it creates exactly the fragmented experience described earlier in this article.
Google Workspace — Proprietary, Not ActiveSync
Google Workspace uses its own proprietary synchronisation protocol called Google Sync. On Google's own apps (Gmail, Google Calendar, Google Contacts), synchronisation works well. But on non-Google devices and apps, the experience can be inconsistent. Google has historically enabled and then disabled ActiveSync support multiple times, and the current situation varies depending on your plan and when your account was created. If your team uses a mix of devices and apps — which most small businesses do — relying on Google's proprietary sync can be limiting.
Microsoft 365 — Full ActiveSync
Microsoft 365 (formerly Office 365) includes full ActiveSync support. Email, calendar, contacts and tasks synchronise across devices reliably. The trade-off is cost — Microsoft 365 business plans start at a higher price point than many specialist email providers, and you are paying for a full productivity suite (Word, Excel, Teams) even if all you need is email. For businesses already committed to the Microsoft ecosystem, this makes sense. For businesses that primarily need reliable, well-synchronised email, it may be more than you need.
Specialist Providers with Axigen — Full ActiveSync
Email providers built on the Axigen mail server platform — including epost.plus — include full ActiveSync as a standard feature. Axigen is an enterprise-grade email platform used by organisations worldwide, and its ActiveSync implementation is mature, reliable, and fully featured. You get push email, calendar sync, contact sync, task sync, remote wipe and security policies — all included in the plan price, not reserved for a premium tier.
epost.plus includes ActiveSync in every business email plan — not as a paid upgrade but as a standard feature. Combined with the included eM Client desktop application, you get a complete synchronisation solution across every platform: Windows, macOS, iOS, Android and webmail. One account, every device, everything in sync.
Which Email Apps Support ActiveSync?
Having ActiveSync on your email server is only half the equation. The email app on your device also needs to support it. Here is a practical overview of the most common options.
eM Client (Windows and macOS) — Full Support
eM Client is a full-featured desktop email application for Windows and macOS that supports ActiveSync completely. When you connect eM Client to an ActiveSync-enabled email server, your email, calendar, contacts and tasks all synchronise immediately. The interface is clean, modern and fast. eM Client supports multiple accounts, making it easy to manage business and personal email in one application. A free version is available for personal use, and eM Client is included at no extra cost with epost.plus business email plans.
Microsoft Outlook (Windows and macOS) — Full Support
Microsoft Outlook has supported ActiveSync for many years and offers a comprehensive email, calendar and contact management experience. It is powerful but can feel complex and resource-heavy for small teams that do not need its more advanced features. Outlook is included with Microsoft 365 subscriptions but is expensive as a standalone purchase. If your business is not already invested in the Microsoft ecosystem, it may be more application than you need.
iOS Mail (iPhone and iPad) — Built-In ActiveSync
Apple's built-in Mail, Calendar and Contacts apps on iPhone and iPad support ActiveSync natively. When you add an ActiveSync account in your iPhone settings, email, calendar and contacts begin syncing immediately. There is nothing extra to install. This makes iOS one of the most straightforward platforms for business email synchronisation — you set it up once and it simply works.
Android Mail — Built-In ActiveSync
Most Android devices include built-in ActiveSync support through the default email and calendar apps. Samsung, Google Pixel, and other major manufacturers all support ActiveSync connections. Setup is straightforward — add your account as an "Exchange" or "ActiveSync" account, enter your credentials, and synchronisation begins. Calendar, contacts and tasks are handled through the device's built-in apps.
Mozilla Thunderbird — IMAP Only, No ActiveSync
Thunderbird is a free, open-source email client that is popular among technically minded users. However, it does not support ActiveSync natively. Thunderbird uses IMAP for email and requires a separate add-on called Lightning for basic calendar functionality. Contact management is limited, and task sync is not available. For personal email or for users who only work from a single device, Thunderbird is functional. For business use where synchronisation across multiple devices matters, it falls short.
Apple Mail (macOS Desktop) — Partial Support
The Mail app on macOS desktop has more limited ActiveSync support compared to its iOS counterpart. Calendar and contact sync work through separate macOS applications (Calendar and Contacts), and the overall integration is less seamless than on iPhone and iPad. For Mac users who need full ActiveSync support on their desktop, a dedicated email client such as eM Client provides a more reliable and complete experience.
Email App Comparison at a Glance
| App | ActiveSync | Calendar | Contacts | Tasks | Platform |
|---|---|---|---|---|---|
| eM Client | Full | Full | Full | Full | Windows, macOS |
| Microsoft Outlook | Full | Full | Full | Full | Windows, macOS |
| iOS Mail | Full | Full | Full | Partial | iPhone, iPad |
| Android Mail | Full | Full | Full | Partial | Android devices |
| Thunderbird | None | Add-on only | Basic | None | Windows, macOS, Linux |
| Apple Mail (macOS) | Partial | Via system app | Via system app | Limited | macOS |
The pattern is clear: if your business needs full synchronisation across all devices, eM Client and Microsoft Outlook are the strongest desktop choices, while the built-in apps on iOS and Android handle mobile synchronisation well. Thunderbird, despite being free and well-regarded for basic email, simply does not compete when synchronisation is a priority.
How epost.plus Delivers the Complete Sync Experience
Synchronisation is only valuable when it works reliably, on every device, without requiring you to think about it. That is the standard epost.plus is built to meet.
epost.plus is powered by the Axigen mail server — an enterprise-grade email platform that has been providing ActiveSync to organisations worldwide for over fifteen years. This is not a bolt-on feature or a third-party integration. ActiveSync is built into the core of the email platform, which means it is fast, reliable, and fully featured.
Here is what that means for your business in practical terms:
- One account, everything syncs — Set up your epost.plus account once on each device and your email, calendar, contacts and tasks synchronise automatically. No separate configurations, no additional protocols, no fiddling with settings.
- Push email on every device — New messages appear instantly on your phone, laptop and tablet. No polling delays, no manual refresh, no missed time-sensitive messages.
- Shared calendars for your team — See when colleagues are available, schedule meetings without email chains, and keep everyone's diary synchronised in real time.
- Remote wipe for lost devices — If a phone or laptop goes missing, an administrator can erase all business data from the device remotely. Your data stays safe on the server.
- eM Client included — Every business email plan includes the eM Client desktop application for Windows and macOS at no extra cost. No need to search for, evaluate, or purchase a desktop email client separately.
- Webmail access — Full access to your email, calendar and contacts from any web browser, anywhere in the world. Useful when you are using someone else's computer or a device where you cannot install software.
- Full security stack — Every epost.plus account includes SPF, DKIM and DMARC email authentication configured to the strongest levels. Your email is not just synchronised — it is protected against impersonation and spoofing.
- UK and EU data centres — Your email data is hosted in UK and EU data centres, fully compliant with GDPR. Your synchronised data stays within jurisdictions you can trust.
epost.plus runs DMARC at p=reject with strict alignment, MTA-STS in enforce mode, DANE certificate pinning and DNSSEC — the complete email security stack. Your synchronised email is not just convenient, it is protected by the same enterprise-grade security used by banks and government organisations. You get synchronisation and security as standard, not as optional extras.
The combination of Axigen's ActiveSync, the included eM Client desktop application, and built-in mobile support means that epost.plus provides a complete synchronisation experience out of the box. You do not need to research compatibility, purchase additional software, or configure multiple protocols. You sign up, set up your devices, and everything works.
For UK small businesses — whether you are a sole trader with a phone and a laptop, or a team of twenty with a mix of Windows, Mac, iPhone and Android — epost.plus provides the same seamless synchronisation experience. One email system, every device, always in sync.
Business email plans are ordered through smartxhosting.uk, where you can choose the plan that fits your team size and requirements. ActiveSync, eM Client, webmail, spam filtering, and the full security stack are included in every plan.
Frequently Asked Questions
What is ActiveSync and why does my business need it?
ActiveSync is a protocol — a set of rules — that keeps your email, calendar, contacts and tasks synchronised across every device in real time. Think of it as a universal translator between your email server and your phone, laptop and tablet. Without ActiveSync, you would need to set up email, calendar and contacts separately on each device, and changes made on one device would not automatically appear on the others. For any business that uses more than one device, ActiveSync eliminates duplicate entries, missed appointments and out-of-date contact details.
Does ActiveSync work on iPhone and Android?
Yes. Both iOS and Android have built-in ActiveSync support. When you set up your email account on an iPhone or Android phone using ActiveSync, your email, calendar, contacts and tasks all synchronise automatically. There is nothing extra to install — the feature is part of the operating system. This means your business email works the same way on every mobile device, regardless of whether your team uses iPhones, Samsung phones or any other Android device.
What is the difference between ActiveSync and IMAP?
IMAP handles email only. It lets you read, send and organise email messages across devices, but it does not synchronise calendars, contacts or tasks. You would need to set up each of those separately using different protocols and different apps. ActiveSync handles everything in a single connection — email, calendar, contacts and tasks all stay in sync through one account setup. For a business that relies on appointments, shared calendars and a central contact list, ActiveSync is significantly more practical and saves a great deal of time.
Can I use ActiveSync with Thunderbird?
No. Mozilla Thunderbird does not support ActiveSync natively. It uses IMAP for email, and calendar functionality requires a separate add-on. If synchronising calendars, contacts and tasks across devices is important to your business — and for most businesses it is — Thunderbird is not the best choice. Desktop email clients such as eM Client and Microsoft Outlook support ActiveSync fully and provide a complete synchronisation experience out of the box.
Is ActiveSync included with business email plans or does it cost extra?
This depends on your email provider. Some providers include ActiveSync in all plans, while others reserve it for premium tiers or charge an additional fee. With epost.plus, ActiveSync is included in every business email plan at no extra cost. You get full synchronisation of email, calendar, contacts and tasks across all your devices as a standard feature, not an upgrade.
What happens to my data if I lose my phone?
With ActiveSync, your data is stored on the email server, not just on the device. If you lose your phone, your email, calendar and contacts are safe — they are still on the server and on your other devices. Better still, ActiveSync supports remote wipe, which means your email administrator can erase all business data from the lost device remotely. Once you get a replacement phone, you simply set up your account again and everything synchronises back automatically.
Do shared calendars work with ActiveSync?
Yes. ActiveSync supports shared calendars, which means team members can view each other's availability, schedule meetings without email back-and-forth, and see updates in real time across all devices. When someone in your team books a meeting, it appears on every participant's calendar immediately — on their phone, laptop and tablet. This is one of the most valuable features for small businesses that need to coordinate schedules without the overhead of a complex project management system.