That is because there not a clear upgrade path. If you want more info let me know. You install a new AAM and then use message move from Mutare or have the users setup their new mailboxes.
We migrate our users with ProVision, I'm not aware of any free tools available to customers that will truly migrate the data. Typically our customers (if they don't have us migrate them) will just build the mailboxes again from scratch.
but if we want to upgrade existing hardware based MM 5.2 to AAM then we have to prepare new physical hardware to AAM or there is a way to upgrade it on the existing servers ?
No easy way with existing servers unless you want to Stage/Build/Test/Program and populate subscriber information all in one go. I'd definitely recommend new hardware, or run it in VMWare.
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