(They were ESYS, they merged with ISODE to become MessagingDirect, but
there are others subscriber who can tell that story...)
Our institution is actually going down this path as well, but have
hit a speed bump in keeping the message flags in a mailbox conversion.
"seen" state is a simple fix, bu
MessagingDirect is now "ACI Worldwide". The continued direction of their
IMAP server is the "Sendmail Advanced Message Server" (SAMS). There are
utilities to migrate/upgrade Simeon 1.x, 2.x, and Mstore 3.x to SAMS 1.x
(which is based on Mstore 3.x). If you are not moving forward with the
product