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What is Exchange ActiveSync?

Exchange ActiveSync (EAS) is a protocol to synchronize email, contacts and calendars. You can use it to set up your email account on mobile devices and newer Microsoft Windows desktop clients.

The advantage of EAS over IMAP (or POP) is that, in addition to your email, it also syncs your contacts and calendar. For large accounts (more than 10.000 emails) we recommend you to use IMAP.

You can use the following settings:

  • Username: your complete email address
  • Password: the one you also use for Webmail
  • Server: m.one.com
  • Domain: leave empty if you are asked to enter something here
EAS is supported on iPhone, iPad, Android mobile devices, Windows 8 + 10 mobile, Windows Outlook 2013 + 2016, Windows 8 + 10 Mail desktop clients.

Do you need more help?

Check out our step-by-step guides below for detailed instructions.

Using Exchange Active Sync on iPhone
Using Exchange Active Sync on Android
Using Exchange Active Sync on Windows Phone
Setting up Outlook 2016/13 on Windows with EAS
Setting up Windows 10 Mail with EAS

Related articles:

EAS troubleshooting guide
What is IMAP and POP3?