Legacy mailboxes and Exchange 2007

If for some reason you manage to create a 2007 mailbox using 2003 AD to drive the process you will end up with a Legacy mailbox on 2007 that will not function properly. To get around it you can either delete the mailbox and start over properly or run a command from the 2007 console.

That command is:

Set-Mailbox user@email.com –ApplyMandatoryProperties

*note - that last part is case sensitive.


Running this will fix a wrongly created mailbox and give it the right properties so it functions correctly.