I am a noob to Zimbra.

I've used imapsync to move mails from my old IMAP server to new Zimbra 6.0.
Used the following options for my users.

imapsync --nosyncacls --syncinternaldates \
--host1 server1 --authmech1 PLAIN --user1 user1 --password1 password\
--host2 server2 --authmech2 PLAIN --user2 user2 --password2 password

Now it has preserved the flags of Read/Unread which i am able to see on web client. But while using the POP3 client all messages are being downloaded again.

Can someone guide me
- Are POP3 and IMAP flags are distinguished separately?
- Is there a command to issue from shell, to mark all messages as Read for POP3 clients? (I can go by with that as server isn't live yet)

Appreciate your help!!!
Mani