Exchange Server 2010 Service Pack 1 (SP1) has been released raising the Exchange version number to 14.1.218.15. You can download Exchange 2010 SP1 from Microsoft
For those still unaware, the 500Mb+ file (1,3 GB extracted) contains the full set of binaries; you can use it to upgrade existing RTM installations but can also deploy new Exchange 2010 SP1 installations.
Prior to upgrading or installing, be sure to check out the Release Notes, especially the list of required hotfixes and components:
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