What Is ActiveSync? Email, Contacts and Calendar Sync Explained

When you set up email on a phone and your contacts and calendar appear too - perfectly in sync with your other devices - that is often ActiveSync at work. It is one of those behind-the-scenes technologies that makes modern email feel effortless. Here is what it does, in plain English.

What ActiveSync is

Exchange ActiveSync (EAS) is a syncing protocol designed for mobile devices. Unlike protocols that handle only email, ActiveSync keeps email, contacts and calendars in sync together, in real time, across all your devices.

Add a contact on your phone and it appears on your laptop. Accept a meeting on your laptop and it shows on your phone. That seamless, everything-in-one-place experience is what ActiveSync provides.

ActiveSync vs IMAP

You may have seen both offered when setting up mail:

• IMAP syncs your email across devices, keeping messages on the server. It does not handle contacts or calendars.
• ActiveSync syncs email, contacts and calendars together, and is optimised for mobile - including features like remote wipe.

We cover the email side in IMAP vs POP. The short version: IMAP is great for mail; ActiveSync adds contacts and calendars and mobile-friendly management on top.

Why it matters for business

For a team, ActiveSync means:

• One synced experience - mail, contacts and calendars match everywhere
• Fast setup - add one account and everything appears
• Mobile management - admins can enforce policies and, if a device is lost, wipe the account data remotely

That last point is a real security benefit: lose a phone, and the business mailbox can be removed without touching personal data.

How to use it

On most phones, adding your account as an Exchange account uses ActiveSync automatically. Your email host provides the server details. With DigiCloudMail, you get ActiveSync and IMAP support plus a fast webmail, so every device stays in sync - covered in webmail and mobile access.

The takeaway

ActiveSync is what makes your email, contacts and calendars feel like one connected system across every device - with handy mobile management for businesses. Pair it with a fast webmail and native app support, and your team stays in sync wherever they work.

Want email that just syncs everywhere for your team? Contact us.