I would really re-think migrating users to a 5.5 server. But if you have to I don't know of any tool you may need to use exmerge to copy the data to a PST then delete the mailbox on the 2003 server,
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This article lists the top 5 free OST to PST Converter Tools. These tools save a lot of time for users when they want to convert OST to PST after their exchange server is no longer available or some other critical issue with exchange server or impor…
In this video we show how to create a mailbox database in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Servers >> Data…