As Exchange 2010 is almost there you may got the question from which version of Exchange can I upgrade to 2010 and which versions can run besides each other. Below an overview of this and the prerequisites you must met:

[table id=2 /]

When you would like to have more info after having a look at the table have a look at the sites below:

**Exchange 2007

** Upgrading to Exchange 2007 open

Coexisting with Exchange Server 2003 and Exchange 2000 Server open

**Exchange 2010

** Planning Roadmap for Upgrade and Coexistence – Exchange 2003 open

Planning Roadmap for Upgrade and Coexistence – Exchange 2007 open


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Johan Veldhuis