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migration from Windows Server 2003 to Windows Server 2008,2012

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,

option 1.
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?

option 2.
Can I run two AD types, 2003 and 2012? and keep exchange 2003?

option 3.
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.
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crcsupport
Asked:
crcsupport
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1 Solution
 
Alex Green3rd Line Server SupportCommented:
1. You won't be able to update AD to 2012 if you have any 2008 or 2003 boxes in there.

2. No you can't run 2 AD types, it'd be either 2008 mixed mode or 2012. I'm not sure if there is a 2012 mixed mode to be honest

3. If you want to migrate exchange 2003 to exchange 2013 that's pretty easy to be honest. Build an exchange 2010 server, migrate to that, then build another server with exchange 2013 on it and then migrate from 2010 to 2013.
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crcsupportAuthor Commented:
what about sbs2011, do they sell anymore through volume licensing? Cost of exchange upgrade is really bothering. I looked around, Successor version of SBS2011 is not available anymore, seems like it's gone.
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Alex Green3rd Line Server SupportCommented:
I've never really dealt with SBS2011, however there is a Windows Server 2012 R2 Essentials which is the next in line from 2011.

Not sure how much it costs, probably around the £500 - £600 mark at a guess which is in the same ballpark as 2011
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