No way for us to know what's going on. You need to use managed code
debugging and Fusion logging to see what's going on, assuming that your
addin is failing to load. If it is loading then you need to run in debug
mode and add lots of error logging to see where things fail.

Assuming the addin just fails to load at all, see
http://blogs.msdn.com/vsod/archive/2...-failures.aspx
for information on troubleshooting addin load failures with managed code.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007.
Reminder Manager, Extended Reminders, Attachment Options.
http://www.slovaktech.com/products.htm


"Jason" wrote in message
...
One of out customer installed multiple add-ins.
Our older version worked on his machine but not the newer version.
Disable or remove all other add-ins from Outlook add-in manager, re-enable
or reinstall our add-in won't work.
Reinstall Outlook won't work.
Add VSTO environmental variable does not help, not showing or logging
anything.
The loadstatus of registry key is the OK value 3 before uninstall and
after reinstall our add-in.
Other machines have no problem.

Any thoughts?