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How to block ActiveSync for Office 365 users in Exchange Online

Navigate to the Exchange Control Panel

Browse To the Exchange Control Panel: http://outlook.office.com/ecp

Select mailboxes and locate the desired mailbox.

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Select the desired mailbox via search.

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Under mailbox features -> Disable, select Exchange ActiveSync

Under mailbox features -> under phone and Voice Features -> Disable ActiveSync, choose.

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Query mobile devices through AciveSync?

The View details option (as shown in the image above) allows you to view all currently connected devices.

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Login at PowerShell in Exchange Online

Using these instructions, connect to Exchange Online with PowerShell.

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Block ActiveSync through Microsoft PowerShell

Set-CASMailbox -Identity <Mailbox ID> -ActiveSyncEnabled $False

Also read

How to set an Out-Of-Office or status message in Microsoft Teams?
Restore a mailbox in another mailbox when deleted - Exchange Online
Tutorial: Adding 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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