How to block ActiveSync for Office 365 users in Exchange Online
![How to block ActiveSync for Office 365 users in Exchange Online](https://365tips.be/wp-content/uploads/2021/11/image-126.png?v=1636628347)
Navigate to the Exchange Control Panel
Browse to the Exchange Control Panel: http://outlook.office.com/ecp
Select mailboxes and search for the mailbox you want.
![](https://365tips.be/wp-content/uploads/2020/12/image-133-1024x634.png)
Select the mailbox you want from search.
![](https://365tips.be/wp-content/uploads/2021/11/image-125-1024x378.png?v=1636628297)
For mailbox features, select -> Disable Exchange ActiveSync
Under mailbox features -> under phone and Voice Features -> choose Disable ActiveSync.
![](https://365tips.be/wp-content/uploads/2021/11/image-126-1024x743.png?v=1636628347)
Requesting mobile devices via AciveSync?
Via the option View details (as shown in the image above) you can view all currently connected devices.
![](https://365tips.be/wp-content/uploads/2021/11/image-127-1024x911.png?v=1636628429)
Log in via PowerShell in Exchange Online
These instructions will connect you to Exchange Online with PowerShell.
![](https://365tips.be/wp-content/uploads/2020/03/image-13.png)
Block ActiveSync via Microsoft PowerShell
Set-CASMailbox -Identity <Mailbox ID> -ActiveSyncEnabled $False
Also read
How to set up an Out-Of-Office or a Status Message in Microsoft Teams?
Restore one mailbox in another mailbox when deleting – Exchange Online
Tutorial: Add email alias in Office 365, Exchange or Active-Directory
Set up out of office in office 365! Online or in Outlook 2016
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