You may want to try clearing the forms cache.

If you close outlook
Perform a FIND (click on desktop and press <F3>)
 (If you are using XP or W2K operating system be
  sure to look in hidden files)
Look for FRMCACHE.DAT file.
Delete it from the find window.
Restart Outlook.

When you restart Outlook it will rebuild a fresh new
FRMCACHE.DAT file.

Outlook uses forms for everything. Sometimes these
get corrupt and need to be rebuilt.

Hi Folks!

I have a serious problem with a PC w/OL2002 on W2K.

He logs in to his Mailbox using OL2k2. In his calendar there are some
appointment-series which HE can not open. Error: "Object not available...".
NOW his co-workers which have access to his calender can open there items.

I tried to solve the problem like:

a) give the user owner-right to his own calendar ( i know sounds silly - but
hey )... didnt work
b) created as this User a new Appointment-Series. After saving User cant
access the just created Series 8(( !
c) Started Outlook with all available start-up parameters ..incl.
/CleanFreeBusy .... didnt work
d) Used SCANOST 2 check his offline-file ... bring A LOT of Errors. Did
repair .... no change
e) checked with SCANOST the OST-file again ...same errors ... looks like the
repair didnt even work 8(((!
f) Used the Repair-function from Office and reinstalled Office ... no change
....
g) than even deleted that errours-OST-File ... no change .... *ggggrrrr*

HEEEELP!! The Client-PC has 2much data and applications on it to just ...
clean and install the complete OS ....

Hope one of you folks has an idea .. which file .. or DLL I could try to
overwrite ....