How to disable Exchange ActiveSync for users in Office 365

Applies to: Exchange Online

INTRODUCTION

This article describes how to disable Microsoft Exchange ActiveSync for users in Microsoft Office 365.

Office 365 admins can use the following to disable Exchange ActiveSync access for users.

To disable ActiveSync for users by using Exchange Online PowerShell, follow these steps:

Connect to Exchange Online by using remote PowerShell. For more information about how to do this, go to the following Microsoft website:
Connect to Exchange Online using remote PowerShell
Do one of the following:
- To disable ActiveSync connectivity for a single user, run the following command:
```
Set-CASMailbox -Identity <Mailbox ID> -ActiveSyncEnabled $False 
```
- To disable ActiveSync connectivity for a group of users, use the Get-User cmdlet to change the scope of the command.
  
  For example, to disable ActiveSync for all the users in the Sales department, run the following command:
```
Get-User -RecipientTypeDetailsUserMailbox | where {$_.Department -eq "Sales"} | Set-CASMailbox -ActiveSyncEnabled $False 
```
- To disable ActiveSync for all users in an organization, run the following command:
```
Get-Mailbox | Set-CasMailbox -ActiveSyncEnabled $False 
```

To disable ActiveSync for users in Office 365 by using the Exchange admin center, follow these steps:

Sign in to the Office 365 portal (https://portal.office.com) as a global admin.
Click Admin, and then click Exchange.
In the left navigation pane, click recipients, and then click mailboxes.
Select the user mailbox that you want to change, and then click Edit ( ).
Click mailbox features, and then click Disable Exchange ActiveSync.
Click OK.

For more information about the Windows PowerShell cmdlets that are mentioned in this article, go to the following Microsoft TechNet websites:

Still need help? Go to Microsoft Community.

Last Updated: Dec 28, 2016