duplicate OAB Public folders in Exchange 2003/2010 mixed migration environment
Posted on 2015-01-26
I am migrating from Exchange 2003 to 2010. One forest, One domain. All of the end users are on Exchange 2003 still. There are no Outlook clients older than Outlook 2003 SP2. I have moved the OAB to Exchange 2010.
Any new mailboxes added to Exchange 2003 are not appearing in the GAL of the 2003 mailboxes.
I investigated and found I had replicated the OAB System Public Folders from 2010 to 2003 and visa versa. As a result, both my 2010 PF server and my 2003 PF server have duplicate OAB Version 4, 3a and 2 folders. So there are two 4s, two 3as and two 2s. By examining the folder properties in PFDAVAdmin and ExFolders, I can see that the 2003 PF server is posting to one of each version duplicate and 2010 to the other. It appears that the 2003 server mailboxes are dependent upon the 2003 "Version 4 OAB" (for example) but the 2010 server is generating the OAB and posting to the other "OAB Version 4" from the 2010 servers.
Exchange 2003 Server Exchange 2010 Server
Version 2 OAB (from 2003) Version 2 OAB (from 2003)
Version 2 OAB (from 2010) Version 2 OAB (from 2010)
Version 3a OAB (from 2003) Version 3a OAB (from 2003)
Version 3a OAB (from 2010) Version 3a OAB (from 2010)
Version 4 OAB (from 2003) Version 4 OAB (from 2003)
Version 4 OAB (from 2010) Version 4 OAB (from 2010)
So how do I fix this?
If I remove the replica of the Version 4 OAB (from 2003) from the 2003 PF server, will the Exchange 2003 mailboxes then start using Version 4 OAB (from 2010)?
Is there another solution?