Hi Guys,

I need your expertise guidance on Exchange server consolidation. The environment is very complex. It has almost all versions of exchange starting from 5.0 to 2010 in different locations and different AD forests/domains. We are looking for a solution of Unified Exchange email system (On premise). We are planning to build a new exchange organization with Exchange 2013. Could anyone guide how to go about this consolidation.  What are challenges, Risks, limitations ..etc involved in this project?

How can we do cross forest mailbox migration in this scenario? Please sugges

It's not a good candidate for forum discussion :)

The best resource who can help you to handle such situation,

1. Engage Microsoft Consultancy Service.

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3. Your trusted local consultant