The current Build numbers for Exchange are listed HERE and HERE.
If you want to see which version your server is running, simply run
‘get-exchangeserver |ft name,admindisplay*’
in the Exchange PowerShell console.
Exchange 2013 RTM
Exchange 2013 RTM CU1
From the initial CU1 release, it looks like finding your exact Exchange version will be much easier now as these act more like Service Packs than Rollup Updates. This is certainly a boon to Exchange Admins, Engineers and Consultants.
Verify the numbers you get from this page. Here is the chart that is currently on the page now:
Your Exchange Server version can also be viewed in the EAC:
Exchange 2013 RTM
Exchange 2013 RTM CU1
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