Windows server replacement

I maintain the network of a small company
There is a Windows 2003 server with the following functionalities for the users :  file system, active directory, DHCP, DNS, WINS, RAS and SQL !
I will replace it, it becomes too old.
Two questions :
Shall I install Windows server 2008 or 2012 on the new hardware ?
Where can I find an easy way documentation for the migration ?
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LeTayAsked:
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aindelicatoCommented:
Server 2008 still has full support until 2020 ..and I prefer 2008 over 2012 as 2012 is night/day, though full of features.

I would also recommend splitting these roles if at all possible.

You can keep AD, DHCP, DNS on the same server, but put file server and sql on a different server.

Microsoft has migration guides for any direction you go in.

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pgm554Commented:
You running SBS?
If so ,I'd go to 2011.
McKnifeCommented:
Hi.
> Server 2008 still has full support until 2020
- not quite. "Full" support means feature updates and not only security updates. 2008+2008 R2 will leave the full (="mainstream"-) support phase next year, 2012+2012 R2 will leave that phase 2018. The extended support for 2008ers however lasts until 2020 (while to 2023 for the 2012ers).
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