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Script repository

Synchronize allowed ActiveSync devices to Exchange Online

May 08, 2023 Views: 2273

The script synchronizes the list of allowed ActiveSync devices of a user from on-premises Active Directory to their Exchange Online mailbox. To run the script, you can create a custom command or scheduled task configured for the User object type.

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PowerShell
# Get Microsoft 365 object ID
try
{
    $objectId = [Guid]$Context.TargetObject.Get("adm-O365ObjectId")
}
catch
{
    return # No Microsoft 365 account
}

# Get device IDs
try
{
    $deviceIDs = $Context.TargetObject.GetEx("msExchMobileAllowedDeviceIDs")
}
catch
{
    $deviceIDs = $NULL
}

# Connect to Exchange Online
$Context.CloudServices.ConnectExchangeOnline()

# Set devices
Set-CASMailbox -Identity $objectId.ToString() -ActiveSyncAllowedDeviceIDs $deviceIDs

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