Hi there
Check if all/some of them are using Cached Exchange mode in Outlook. If so,
try temporarily switching it off, see if that helps. If it all works fine in
Online mode then try recreating/resyncing the OST files.

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TechieBird
http://bwain-dump.blogspot.com
> We have Small Business Server with Exchange and the two assistants have
> access to the President's calendar for scheduling appointments. Sometimes
> the appointments show up, sometimes not. He and one assistant have Office
> 2007, the other has 2003. There are problems with both showing, is there
> something else that has to be done besides just typing in the event? Thank
> you in advance!
OsuJennifer - 15 Jun 2007 18:45 GMT
Hi there, what are OST files? They are in Cached Exchange mode as default so
I am going to try switching it off. thank you!
> Hi there
>
[quoted text clipped - 8 lines]
> > something else that has to be done besides just typing in the event? Thank
> > you in advance!
Diane Poremsky - 15 Jun 2007 22:16 GMT
OST is offline file, which is required for cached exchange or the more
traditional offline mode.

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Diane Poremsky [MVP - Outlook]
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> Hi there, what are OST files? They are in Cached Exchange mode as default
> so
[quoted text clipped - 18 lines]
>> > Thank
>> > you in advance!