We use Zimbra in our company, not sure which version, could be a 6.x but I am really not sure. (The login screen sports a "2011" at the bottom if that tells you something.)
Now the curious thing is that whenever my colleagues go on vacation and configure their away / vacation / OOF messages, I (and everybody else who e-mails them) receive these messages multiple times during their vacation. We simply cannot explain this to ourselves.
Except maybe if Zimbra would kind of reset the "I have sent OOF messages" indicator if a user logs in during the validity of his OOF message. Is this possible? The thing is, many of my colleagues simply cannot let go. They often log in during their holidays to see what's up.
Thanks for any explanation (or verifying my assumption)!