Thanks very much for that. It confirms what I had thought.

I had thought about IMAP, but this would mean leaving a Windows machine active to run Mercury?

There is a mail server available for the QNAP (Xdove) that would run directly on the server and could be accessed from either end.

The issue of network latency then comes in as although both ends have reasonable broadband speeds (12mb/0.7 & 8Mb/1Mb) this can fluctuate as with any ISP, particularly when a MUX is being hammered by many users.

The Rsync approach with Pegasus at both ends seemed best to me as the Rsync runs overnight when things are a lot quieter and the 2 locations are only 1 timezone apart. Although initial Rsyncing takes a long time (it does on any system) subsequent Syncs are very fast as only changes are processed. We are currenltly keeping about 30Gb of stuff in Sync with no problems, in an average of about 2½ hours.

The client has huge email files (loads attachments as he is a legal eagle) and that is another reason why I shied away from the IMAP/Single Transport approach.

Thanks very much for you advice, it is much appreciated

I am about to migrate a client from Thunderbird to Pegasus, as he runs multiple email accounts and uses a NAS (QNAP) to store all his data.

The guy works from two bases in different countries and I have set up an RSync (Remote Replication)  between the two servers to replicate from and to the "Live" site.

Providing both server installations are identical (i.e. paths are the same), can anyone see any problems using Pegasus at either end? The files are only written to by Pegasus from the end that is "Live". The "Remote" end would get a mirror of the files with an overnight RSync job.

When he switches bases, the RSync would be reversed so that "Remote" becomes "Live"

Is definitely do-able.

You'll need to take care with the rsync running, when Pegasus is closed (and going the correct way :)).

Depending on the amount of data needing to be accessed regularly, and connection speed, would IMAP be an option?

You could run Mercury at the main location and connect via IMAP from either location.