Excluding Resource Mailboxes (e.g. rooms) from Dynamic Distribution Groups in Office365

I hadn’t noticed until today that rooms are included in Office365 dynamic groups even if you selected “Users with Exchange mailboxes”. This creates an interesting effect if you send an appointment to that group, you will automatically book all your meetings rooms as well. Not necessarily what you want. The solution is fairly straight forward. … More Excluding Resource Mailboxes (e.g. rooms) from Dynamic Distribution Groups in Office365