Thanks Mr. Reed for the heads up
Microsoft announced the availability of Exchange 2003 Enterprise Server to its MSDN customers today.
Earlier this week Microsoft announced that Exchange is Released To Manufacturing and calling it "the most reliable and secure version of Exchange to date". Microsoft also offered non-MSDN customers the chance to trial the final product.
Microsoft also announced it will introduce a new per-user licensing option with the release of Exchange Server 2003 later this year, legitimizing the way many companies use existing versions of Exchange. The new license type will be offered in addition to the per-device license introduced with Exchange 2000 Server
Screenshot: Exchange Server 2003 on MSDN