We are running Exchange 2003 SP2. 4 of our DC's are Windows 2003 SP2, this includes the schema master. The remain 3 DC's are Windows 2008 R2. We installed Exchange 2007 SP1 with no problems, and have been migrating mailboxes over to the new Exchange environment. Last night, an administrator apply SP 2 and SP 3 to the Exchange 2007 servers (CAS/Hub and Mailbox). Now all of our DC's, with the exception of the schema master, report that the schema version is different than that which is on the Schema Master.
Questions before I begin to yell and scream:
1) Did the setup /prepareAD need to be run before applying SP2 or SP3?
2) Since these service packs have been applied to the Exchange 2007 servers, can these be reversed?
3) Since the answer to 2 is probably no, is there anything we can do to get the schema between the 7 DC the same.