You only need it installed on one of the IMAP servers. I find it easier to install it on the destination server, and then run it against localhost like imapsync --host1=remotehost --host2=localhost --user1= ... etc. But it will work from either side. You can even run it from a separate box and tell it to connect to the two remote IMAP server, although the performance will decrease in that setup.
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Freddie
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