I have windows 2003 domain with exchange 2003 and sql 2005. I migrated SQL to 2012 and some member servers to 2012, but now the hard part, migrating AD from 2003 to 2012. I'm trying to minimize the cost of server software license fee so it's ok to mix it. But referring to this matix, http://technet.microsoft.com/en-us/library/ff728623(v=exchg.141).aspx
, it seems I have to retire all 2003 server platform, can't mix.
Especially keeping exchange 2003 doesn't seem possible if I want to upgrade AD to domain. So, options I have in mind is,
Keep AD servers in 2003 and exchange 2003, use 2012 for only member servers. Is this case, can I convert AD servers to virtual machine? I guess one of AD servers have to remain as a physical server to process AD login of a vm host server?
Can I run two AD types, 2003 and 2012? and keep exchange 2003?
upgrade all AD servers to 2012 and excahnge 2003 to exchange 2013. If this is the only option I have, what is the procedure to migrate 2003 environment to 2012/2013.