I have been following this excellent article http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2881-Migrate-Small-Business-Server-2003-to-Exchange-2010-and-Windows-2008-R2.htm
to migrate from SBS 2008 to Windows Server 2008. I am at the point where I am going to transfer all 5 FSMO roles to the Windows 2008 Domain Controller and had two questions:
1. After the transfer, do I have to demote the SBS Server immediately or can I let them run together for a few days to make sure everything is okay?
2. Once I demote the SBS Server, how long do I have before I need to permanantly shut it down (21 days)?