For some reason at one site when users login to the OWA and go to the Address Book using the To: link, and then scroll through the address book after about 6 pages it skips a page without any error. You would only notice it if you were looking for it, but for us some of our most important people ar eon that page and its annoying management.
If you skip past a page, going back will actually show the page with the skipped addresses.
None of this happens to clients connected via Outlook, or via LDAP queries.
We have 50 contacts per page, and for us it happens in the R's, when we skip over to the T's, pushing previous page shows allof the R's it skipped over going forward through the address book.
This was really subtle and took us a little while to even take the complaining users seriously, but it is reproducible on our system (or anyone on any system using our OWA).
Any hints ? Clues ? Lines of Investigation ?