I now have 5 computers among 100+ that simply stopped updating the
offline address book.  They give no error message.  nothing is recorded
in the event logs.  success is recorded in the sync log.  it says it
does it, but it doesn't.  The most recent user reported that he
couldn't see a person in his address book that had been hired 4 weeks
ago.  It is the same with all machines.

1. if I tell it to manually download the address book, it says it does
and nothing changes.
2. if I create a new Outlook profile, it downloads a new address book
at that time, but not after
3. If I create a new XP Profile, it will download a new copy and keep
downloading updates for a while, but quits after about 2-3 weeks.  This
causes major issues, so I prefer to avoid it.
4. If I rebuild the machine and copy the user's existing profile onto
it, it still happens
5. If I rebuild the machine and create a new profile for that user, it
will work normally, but this costs a lot of time and a lot of problems.
I would rather avoid this if it is possible.
6. I have gone through the user level registry and found nothing I
could interpret that was wrong.

Has anyone else run into this?  With the frequency I have run into it,
I would highly doubt that other people aren't having this issue too.  I
keep thinking there is something in the user registry that is causing
this, but there are many parts of it I can't decipher.  I also think
there may be something else causing this since I can solve it for a
shot time by creating a new XP profile, but it comes back in a fairly
short time.

Currently for these 5 people, when they call in saying they need an
update, I have them exit Outlook and I remotely delete the OAB files
from their profile.  They can then download a new version, but they can
never update it.  It's barely a patch and causes me some headaches, but
at least they can function.  I have been searching for a solution since
this first popped up 8 months ago.  I really hope someone has an idea.

So nobody has any ideas on this?

Since I can't find the original post and know what you've already tried (a
good reason not to trim posts) - I can only guess that you haven't waited
long enough - outlook doesn't constantly update it and you need to wait 24
hrs. It also could be a server issue, not an outlook issue, so if you
haven't already posted this in the exchange newsgroups, you should.

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