[Dovecot] New Dovecot installation and OE not POPing problems

[techlist06]

Greetings:

Recently I converted my mailserver to Postfix with some local accounts being
accessed via Dovecot and POP3S.

The clients are OE.  The users are reporting that they aren't getting their
messages.  In the past with my old (IW?) POP server, I just used mail -f
/var/spool/user and deleted the "DO NOT DELETE THIS MESSAGE...." message #1
and this cleared any problems with messages being out of sync on what had
and had not been downloaded, etc.

With Dovecot, I don't know how to "bump" the mailbox to get it "reset" so
that OE will download the messages again, and/or get them if it hasn't
already.  Is this possible?

Thanks very much for the time to help,
Scott