moving exchange 5.5 to another server

Hi all

My server is running the following:
Server: NT4.0
Exchange 5.5
the server is the pdc, old administrator did not set proper restrictions thus the server is at 95% capacity on c:\ and also on the drive where the exchange database resides. I have set mailbox restrictions but have also noticed that the server still has accounts & mailboxes for employees whom have left. I deleted one such account and noticed that the priv.edb still remains the same size, what can i do about this n how do i go about getting exchange to reduce it’s Private Information Store. Please email me suggestions.

I also have the option of setting up another exchange server and adding it to the current domain as a member server but how do i go about moving the mailboxes over?

please help….any suggestions will be greatly appreciated.

Kind Regards
VNaidu