Hi, I posted this question a while back and didn't get much response. Since then, I've done a bit more experimenting and wonder if someone can help me move forward towards resolution.

The orignal question...

I'm running Dovecot0.99.13 on Fedora Core 3 and things work fine when using either Thunderbird 1.0 or Outlook Express as IMAP clients. Outlook (2002 SP3) on the other hand runs incredibly slowly, or just outright hangs.

I've discovered that if I delete and recrete .../Maildir in the user account such that the directory exists but is empty, then outlook seems to behave. If on the other-hand, I try to create a folder, with outlook, outlook will hang and the folder won't be created. If I create the folder with another client and then go back to using outlook, outlook will hang.

I've taken some network traces and have annotated them here...

Starting with an empty "Maildir" Time Source Destination Protocol Info 8.515435 192.168.73.3 192.168.73.1 IMAP Response: * OK dovecot ready. 8.516056 192.168.73.1 192.168.73.3 IMAP Request: 0000 CAPABILITY 8.516539 192.168.73.3 192.168.73.1 IMAP Response: * CAPABILITY IMAP4rev1 SORT THREAD=REFERENCES MULTIAPPEND UNSELECT IDLE CHILDREN LISTEXT LIST-SUBSCRIBED NAMESPACE STARTTLS AUTH=PLAIN 8.516733 192.168.73.1 192.168.73.3 IMAP Request: 0001 LOGIN "xxx" "xxx" 8.594634 192.168.73.3 192.168.73.1 IMAP Response: 0001 OK Logged in. 8.640521 192.168.73.3 192.168.73.1 IMAP Response: + idling 8.640709 192.168.73.1 192.168.73.3 IMAP Request: DONE 8.640983 192.168.73.3 192.168.73.1 IMAP Response: 0002 OK Idle completed. 8.641165 192.168.73.1 192.168.73.3 IMAP Request: 0003 LIST "" "" 8.641315 192.168.73.3 192.168.73.1 IMAP Response: * LIST (\Noselect) "." "" 8.642387 192.168.73.1 192.168.73.3 IMAP Request: 0004 LIST "" "INBOX" 8.642956 192.168.73.3 192.168.73.1 IMAP Response: * LIST (\HasNoChildren) "." INBOX 8.657424 192.168.73.1 192.168.73.3 IMAP Request: 0005 LSUB "" "*" 8.657925 192.168.73.3 192.168.73.1 IMAP Response: 0005 OK Lsub completed. 8.660627 192.168.73.1 192.168.73.3 IMAP Request: 0006 IDLE 8.660973 192.168.73.3 192.168.73.1 IMAP Response: + idling

Now try to create a sub-folder using outlook: 0.000000 192.168.73.1 192.168.73.3 IMAP Request: DONE 0.000587 192.168.73.3 192.168.73.1 IMAP Response: 0006 OK Idle completed. 0.000910 192.168.73.1 192.168.73.3 IMAP Request: 0008 IDLE 0.001113 192.168.73.3 192.168.73.1 IMAP Response: + idling

And there outlook just hangs. Killing outlook and starting it again gives this trace: 5.110260 192.168.73.1 192.168.73.3 TCP 1953 > imap [SYN] Seq=0 Ack=0 Win=64240 Len=0 MSS=1460 5.111826 192.168.73.3 192.168.73.1 IMAP Response: * OK dovecot ready. 5.112139 192.168.73.1 192.168.73.3 IMAP Request: 0000 CAPABILITY 5.112600 192.168.73.3 192.168.73.1 IMAP Response: * CAPABILITY IMAP4rev1 SORT THREAD=REFERENCES MULTIAPPEND UNSELECT IDLE CHILDREN LISTEXT LIST-SUBSCRIBED NAMESPACE STARTTLS AUTH=PLAIN 5.112798 192.168.73.1 192.168.73.3 IMAP Request: 0001 LOGIN "xxx" "xxx" 5.127237 192.168.73.3 192.168.73.1 IMAP Response: 0001 OK Logged in. 5.135355 192.168.73.1 192.168.73.3 IMAP Request: 0002 IDLE 5.137334 192.168.73.3 192.168.73.1 IMAP Response: + idling 5.138060 192.168.73.1 192.168.73.3 IMAP Request: DONE 5.138273 192.168.73.3 192.168.73.1 IMAP Response: 0002 OK Idle completed. 5.138505 192.168.73.1 192.168.73.3 IMAP Request: 0004 IDLE 5.138646 192.168.73.3 192.168.73.1 IMAP Response: + idling

And there outlook just hangs again.

Any ideas or help would be greatly appreciated. Thanks,

Md