We have two Windows 2008 r2 servers. One is located in house which runs all domain logins, resources, file sharing etc. The second server is a AD replica which is remotely hosted at our Datacenter using a VPN to communicate. The only major service the second server is hosting is Exchange.
A couple of months ago the Main Active Directory (in house) server crashed and was then restored from a backup. Active Directory was then repaired to make it happy again however the offsite (second server) has not replicated since.
Is it safe to demote and repromoted the offsite server with exchange service simply stopped? Then restart Exchange once it has finished replicating? Will the mailboxes still associate with the correct accounts?
Please note: No major changes have happened in active directory (eg changing users, passwords and new computers). So there shouldn't be any empty mailboxes or new users.