A couple (belated) notes. /Z has a huge performance impact, and MDaemon
likely has no files big enough to matter. Re-copying a 50MB file isn't a
big deal, resuming is more useful for files in the GB range.
/FFT is an interesting one. It shouldn't be needed, but if it is needed
then you might have another problem: Your timestamps are changing enough
that MDaemon might notice and generate new POP3 UIDLs & IMAP UIDs, which
causes all messages to appear as unread and all other flags are lost.
The switch itself won't hurt, just that the problem it solves might have
other side effects as well.
If copying over a network, experiment with /MT as the overhead of small
files is considerable. /MT:4 is a good starting point, /MT:16 is better
if you have higher latency.
I'd suggest starting by adding "*.msg" for the first sync since MSG
files never change (they are only added, copied, moved or deleted),
whereas IMAP.MRK, MESSAGES.IDX and various other files files are written
constantly and will therefore need to be re-copied each time you re-run
robocopy.
Once the files are initially copied, run it again to catch up, then
remove the *.msg parameter to include all the other content.
When you are finally ready to do the changeover, shutdown MDaemon, run
robocopy yet again to bring things fully up to date and proceed.
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