Steven Bink reports that Microsoft is set to deliver the Release Candidate 1 (RC1) version of its upcoming Exchange Server 2010:

Sources tell me that Microsoft will release Exchange 2010 Release Candidate 1 for public download this week!

So get your labs ready with Windows 2008 R2 to start testing out the next generation of the world’s most popular e-mail servers.

Exchange 2010 will help organizations reduce costs, protect communications and delight e-mail users ...

My understanding is that Exchange 2010 will be part of the Office 2010 product wave, but that Microsoft will actually launch it alongside Windows 7 and Windows Server 2008 R2 in October. So it sort of makes sense that the final release would be somewhere between October and whenever the majority of Office 2010 launches in 1H 2010.