There is no solution otegr the ndeletign extend.dat for all users. This is
really an architerctural problem tha tcannot be fixed easily.
Switch to a COM add-in if you can.

Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool

"Michael" wrote in message
news
After uninstalling an Exchange Client Extension it's possible to get the
message "The add-in *** could not be installed or loaded. This problem may
be
resolved by using Detect and Repair on the Help menu" when starting
Outlook.

This happens on multi-user systems because the instruction to rebuild the
add-in cache (extend.dat) is a machine-wide registry value and only the
first
user to start Outlook gets their cache rebuilt properly.

Does anyone have a solution for this besides deleting extend.dat for every
user?

Note: The machine-wide value I'm referring to is:
HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange\Cli ent\Extensions\
4.0;Outxxx.dll;7;000000000000000;0000000000;OutXXX
Outlook deletes this value after reading it, so subsequent users don't see
it.