imap transfer

[Sujit Choudhury]

We have two users.  We would like to copy all the mail from one user to 
another.  What is the best way to do it?
Copying file by file will not work as it would clash with existing names 
like 300. etc.
Renaming is out of question as we would like to preserve both the accounts.
Any idea will be appreciated.

Regards

Sujit
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