This could be almost anything. Do some routine maintenance. You did not post
your mail support mode or information store. Assuming you are using a PST
and Corp/Workgroup mode do the following:
1. Check your PST file for errors
2. Remove and re-add the Outlook Address Book Service
3. Run Detect and Repair

Signature
Russ Valentine
[MVP-Outlook]
Hi Russ,
Sorry for the omission, it is in IMO mode, using a PST for the messages
which appears to be fine, I've already tried detect and repair.
I assume that the outlook address book service only applied to
Corp/workgroup mode as this appears to use windows address book (john.wab)
from some extra digging i've done.
I notice that the windows address book on the start menu is also not working
now so suspect that may be connected. Renaming the john.wab file doesn't
make any difference.
Any ideas? is there a windows address book newsgroup which this would be
more appropriate to?
Thanks for your help so far.

Signature
Regards,
John
> This could be almost anything. Do some routine maintenance. You did not
> post your mail support mode or information store. Assuming you are using a
[quoted text clipped - 17 lines]
>>
>> John
Russ Valentine [MVP-Outlook] - 28 Sep 2004 15:28 GMT
IMO is a problem. You should have told me.
You cannot do any repairs to the address book in IMO. IMO does not use the
WAB, it only uses the WAB engine from OE.
Try the other maintenance first. If that doesn't work, you'll have to
reinstall OE, not Outlook, after renaming the WAB32.DLL. Then disable and
re-enable sharing of the Address Book in OE (not Outlook).
--
Russ Valentine
[MVP-Outlook]
> Hi Russ,
>
[quoted text clipped - 42 lines]
> >>
> >> John