multiple Mail.app instances fighting

[David Blank-Edelman <dnb@ccs.neu.edu>]

Hi-
  Just curious if other people have seen this behavior: we've noticed with a few users that leave their work and home machines on that their two OSX Mail.app instances "fight" over zimbra. This manifests as the two instances basically doing repeated IMAP authentications to our server again and again (so e.g. we had one user whose lines in auth.log were 87% of that logs contents).  Apparently you can see in the activity window tons of "Checking capabilities" when this happens. 

We're running a bit of an ancient version of Zimbra here (hope to upgrade after we get past the beginning of the year maelstrom), so perhaps this isn't as much of a problem with later versions. It is mostly a nuisance (the users can work fine) that fills logs, but beyond that not a real problem.

Is this just us, or have you seen it too and found a way to deal with it?

      -- dNb