This is interesting:
We are in the process of finishing up a bunch of remote mailbox setup on Outlook 2010 for a client with a Greenfield Windows Server 2012 Essentials and on-premises Exchange 2013 Standard setup.
It seems that instead of representing the server name Exchange 2013 likes to drop the mailbox GUID into that spot.
Nothing out of the ordinary is happening mail wise, we just thought it was interesting that we no longer see MailboxServer.Domain.Local as the indicated server name.
Nothing to see here, move along folks! ;)
Microsoft Small Business Specialists
Co-Author: SBS 2008 Blueprint Book
Find out more at