Microsoft will release technical previews of other products in the suite, including Office 2010, SharePoint Server 2010, Visio 2010 and Project 2010, in the third calendar quarter. A technical preview is tested by hundreds of thousands of users, while millions of people will have access to the Exchange 2010 beta, White said.

Another of the Office System products, Office Communications Server (OCS), is on a different schedule. The latest version, OCS R2, was released only in February, and Microsoft has not discussed plans yet for the next big upgrade.

Microsoft will begin the process of upgrading its hosted version of Exchange, Exchange Online, at the same time it ships the Exchange 2010 on-premise product. Exchange Online customers will have the ability to determine when their users are upgraded to the new Exchange 2010 capabilities in Exchange Online, starting in the first half of 2010.