Understanding Terminology: Microsoft Exchange 2007 upgrade
Microsoft Exchange 2007 upgrade
The term “upgrading” when used in the context of Exchange 2007 can be confusing because it is a 64-bit only product, while Microsoft Exchange 2003 is only available in 32-bit. It is hence necessary to first install of the 64-bit Windows Server operating system, to be followed by Exchange 2007; Microsoft Exchange 2007 upgrade requires a fresh installation with no in-place upgrades possible. To reiterate, no upgrade occurs in the literal sense when upgrading to Exchange 2007 from an earlier version of Exchange. Instead, the word “upgrade” here is really used to describe the process of going from a previous flavor of messaging over to Exchange 2007.
Two other terms that are easily confused would be Exchange 2007 migration and transition. The former refers to moving of mailbox data without configuration data. This may occur between other messaging server software such as Lotus Domino or Novell GroupWise, or from Exchange 5.5 to Exchange 2007. Transitions, on the other hand, involve the moving of both mailbox and configuration data to Exchange 2007. A transition can take place from either Exchange 2000 or Exchange 2003 to Exchange 2007. Because the transition happens in stages, there is a period of coexistence, in which the legacy Exchange Server and Exchange 2007 operates simultaneously.
Note that the actual period of coexistence can be short or long depending on your needs.