Moving to exchange

I am running windows server 2008 R2 SP1 Standard.  I need to install a version of exchange.
There will be less than 25 computers on the server, and less than 25 mailboxes with some off the email clients not on the server [remote stand alone computers].

What version of exchange would be the best for this server?
Is it necessary to upgrade Windows server 2008 R2 to Enterprise?
If necessary can the existing server be upgraded to Enterprise from standard without a complete re install of windows server 2008 R2?
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Kyle GreenCommented:
I'm running Exchange 2010 on Windows Server 2008r2 Standard without any issues. There is no requirement for you to upgrade, save that budget for something more fruitful like your disaster recovery plan. Your organization sounds fairly small, which in my mind I equate to limited budgetary means. Do you absolutely require Exchange for your email services? For a company your size you might also want to look into a hosted Exchange solution

You'll do fine with a Exchange 201x Standard with (you'll want to slightly overshoot) 30 to 35 CALs to complete your licensing. Again, standard CALs will allow you basic default retention policies and "standard" ActiveSync functionality, you'll need costlier Standard plus Enterprise CALs if you want custom policies, in-place archival, and other nifty features like Unified Messaging.

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2010 or 2013 will work fine - the issue can be more the performance of the server vs how heavily it will get used. Exchange loves RAM and Disk speed.

I would have been tempted to look at SBS2011 but as you already have 2008 - just get exchange.

Make sure you do all patches and service packs.
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
I would suggest go with Exchange 2010 it is smooth and really stable :)

If you have only 25 Users you could have gone for SBS but as you already have Std W2k8 so just get Exchange 2010 Standard version and that should fit all your requirements

- Rancy
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