Upgrading Windows Server 2008 to Enterprise

I have an Exchange 2010 server on Windows 2008 R2 standard.  I want to upgrade to Enterprise.

From what I understand, Windows 2008 R2 enterprise isn't offered anymore only Standard and DataCenter.  So, does that mean there is a SP or and update that will unlock the BS max memory flag set on Standard? or do I have to buy something to get past that?

Also, how hard is it to do this migration on a live box with Exchange 2010?  Rest assurd there will be a full backup done before the  any attempt.
BufflAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You cannot buy Enterprise anymore because it doesn't exist.  HOWEVER, you can buy Standard 2012 and use Downgrade rights to upgrade your 2008 R2 Standard install to 2008 R2 Enterprise.  (I generally only buy Volume Licenses and as such, you get keys and media online directly from Microsoft.  These days, I'm not sure what the procedure for obtaining those keys would be if you bought retail).

http://blogs.technet.com/b/server_core/archive/2009/10/14/upgrading-windows-server-2008-r2-without-media.aspx

As for doing this with a live Exchange 2010 install on it, that's a separate question and I've never been in a position to do it.  I would expect it to go ok (definitely need a reboot), but MAKE SURE you have backups - GOOD backups.  In fact, I'd probably say your better off MIGRATING to another exchange install on a cleanly installed 2008R2 Enterprise server.  (Even when upgrades work and seem to work flawlessly, lets just say I don't trust Microsoft's upgrade skills and would be concerned that if you ever did have problems they could odd and difficult to troubleshoot and more difficult to fix.
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BufflAuthor Commented:
Thank you for the software information.  I also agree with you completely on doing upgrades and such.  I have never had a good experience doing one with MS products.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Just a small note on 2012 - Standard Edition and Data Center Edition are functionally identical.  Same RAM limit (which is HUGE) and all the same features - the difference is in the number of VM licenses included with it (The number of licensed Windows installs you can have with just the purchased server license - Standard is 2, Data Center is unlimited.  That's why you can buy Standard and downgrade to Enterprise since all the features are the same and the license restriction on VMs is all you face.
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