How to Block Room Bookings with Exchange Online

Many people are working from home at present, and you might want to block their ability to book meetings in physical rooms. Policies can be configured to stop the Exchange Online resource booking assistant accepting meeting requests sent to rooms, with exceptions granted to people allowed to make bookings.

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AutoUpdate versus AutoAccept

Microsoft issued Message Center update MC151582 to tell Exchange Online administrators about a new default value for automatic processing of events sent to room mailboxes. Unfortunately, the PowerShell code in the update contains an error, so here’s some fixed code to check existing values and to set them to the new default, if you want to do that.