I built a test environment in preparation for a migration I am doing. I have a 2007 and 2013 set up.

After I moved the test users from the 2007 exchange server to the 2013 server, they can no longer open the public folders still in the 2007 environment. The error is "the server mailbox cannot be opened because this address book entry is not a mail user.".

The Public Folders will eventually be migrated, but I want to ensure users will still have access to them as they are migrated. What step am I missing?

• Edited by IT2B 13 hours 35 minutes ago

Hello

that's error message showing when starting browsing public folder?

What CU are you running?

Yes. When selecting File > Open > Other User's Folder > Public Folder.

I then select the Public Folder from the address book and get the error. 

I haven't worked much with Public Folders. So if there is a better way please let me know.

What CU are you running?

Looks like there are some steps I still need to take:

Configure legacy public folders where user mailboxes are on Exchange 2013 servers
https://technet.microsoft.com/en-us/library/dn690134%28v=exchg.150%29.aspx

On-Premises Legacy Public Folder Coexistence for Exchange 2013 Cumulative Update 7 and Beyond

http://blogs.technet.com/b/exchange/archive/2014/11/07/on-premises-legacy-public-folder-coexistence-for-exchange-2013-cumulative-update-7-and-beyond.aspx