Background.  Exchange 2007 installed August 2008.  We used a shared mailbox for our hotel staff. "Reservations".  The staff accessing this mailbox did NOT have their own mailbox.  I would create an EMAIL-Security-Group and add the staff to that group.

I would use the Add-MailboxPermission command and Add-ADPermission command to grant the EMAIL-Security-Group Full Access.

When we hired a new reservation agent I would create them in AD and add them to the EMAIL-Security-Group.  Then upon login to our server I would run Outlook for the first time and manually just specify the mail server and mailbox

mail.hotels.com

reservations@hotels.com and click "Check Name" and it would resolve and everything was great.  The user only had the shared mailbox in Outlook and did not have their own mailbox whatsoever.

Now we upgraded to Exchange 2013, all tests come back clean.  Outlook Anywhere is working, ActiveSync is working, PF were migrated etc etc.  Exchange 2007 decommissioned.

Now none of the users that had the shared mailbox setup in Outlook can open it anymore and I can not add any new users either. I get cannot resolve name, could not open folders etc.  I'll post pics if it helps.

I have searched high and low over google and tech net without any answers.

Remember I am trying to have users who do not have any mailbox of their own to be able to open a shared mailbox in Outlook as their ONLY configured mailbox in profiles.  Can someone please try this as I'm not sure if there is something wrong with my Exchange/AD setup or if this feature had been disabled, or if I have to use new powershell commands to tweak what I am doing.  I have been searching for answers now for almost 2 months so I figured I would post it.

I am pretty sure this is an Autodiscover failure.

Clients no longer have a server name to connect to - each mailbox has a unique GUID for the server name.

Therefore I think entering the server name is your error. Try entering just the email address on its own, then let the wizard do its thing. It should then run Autodiscover, get the GUID and connect.

Simon.

Yep that worked! I didn't try just entering the email address and leaving the rest blank.  I knew it was an auto discover issue I just wasn't sure how to change my process.

Thanks.