This shows you how to exclude shared mailboxes from a Dynamic Distribution Group in Exchange Online. We will be using Powershell to make sure your shared mailboxes don’t get spam in them.
This article teaches you how to prevent autodiscover from happening on Exchange Server. This is important on an Office 365 migration when you still need to keep your local exchange server from resolving.
This article goes over Exchange Online Archive Requirements and the headache of licensing for it. I recently completed a staged migration from exchange 2007 to exchange online. If you have any users over 50 GB you need the exchange online archive.