The University of Minnesota reports that a performance issue was
discovered in Outlook 2003 when several (or large) IMAP folders are
subscribed. The problem arises when Outlook checks for mail, scanning
not only the Inbox but also all the IMAP mail folders stored on the
server. Combined with a frequent mail check interval or a relatively
slow Internet connection, this unfavorable configuration can cause
slowness and timeouts in Outlook.
It recommends lengthening the time for automatic Send / Receive.
Tools> Options> Mail Setup> Send / Receive> Setting for group
It recommends unsubscribing from folders and removing the check from
the checkbox "When displaying hierarchy in Outlook, show only
subscribed folders."
Tools> Options> Mail Setup> Send / Receive> (Choose group with IMAP
account)> Edit>
I created a new group to Synchronize one a day and subscribed to all
IMAP folders. I can then work off line without speed issues. Outlook
creates an offline file, or
ost file, if the box is checked in the Send / Receive Group.
There may be better clients available, but I do not want to learn
another programing language. I have spend hours learning VBA and have
numerous macros which I have written.
Thunderbird looks promising, but I do not know how to write extension
in ZUL.
I wish I could but more copies of Outlook 2002. It works great.
There is one more fix I am working on. Outlook sometimes generates an
error "Outlook is unable to download folder (null) from the IMAP" I am
told this can be fixed by setting the Root folder path, but I do not
know what the path is and the Microsoft held does not help.
Change an E-mail account, click "Change", then "More Settings", then
"Advanced" and write "<path>" in Root folder path.
What is the path?
"INBOX" does not work becasue the subfolders disappear.
I am going to try "INBOX/*" and see if that works.