I am moving my office from SBS 2008 to Server standard 2008 R2 with a seperate Exchange server 2010. I have found no documentation on migrating AWAY from SBS 2008 (found a lot on migrating to). I have already migrated the Exchange to the new server (and confirmed as functional), I have already created my new DC and Active Directory is working properly on it. I confirmed that all DNS and DHCP are on the new server, but when i shut down my SBS server all Authentication begins to crawl (10+ minutes to log in). I performed an IPCONFIG /FLUSHDNS to ensure that it is not the former DNS causing the problems.
My understanding is, if I run DCPROMO and demote my SBS server, it will begin to reboot every 5 minutes. Since I do still want this server functional for a week as a precaution (in case something looks good now but didn't transfer right), I would prefer to not have to do that.
Any advice would be greatly appreciated.