What version of Windows are the problem users using? Are they under UAC if
this is with Vista? Did you look at the information about what you have to
do for VSTO addins to get them to correctly install and run when registering
to HKLM?

--
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


"Brian Nicholson" Brian wrote in
message ...
Hello,

We have recently developed a simple add-in for Outlook developed in VSTO
for
a number of our users, but with a few of the users, the add-in simply
doesn't
load.

Currently, we have a setup package that installs the necessary keys in
HKLM
and the necessary FullTrust code group in My_Computer_Zone. The add-in
creates a simple 2-button toolbar in Outlook. We tested the add-in on a
number of machines before pushing it, and it worked on all of them. After
pushing to approximately 30 users, however, we found that add-in toolbar
did
not appear for several people (at least 4-5 that we are aware of).

Here’s where we are stuck: we attempted to fix the issue by installing the
add-in manually for each user. After installation, the add-in works as
expected under the Administrator account used for installation. If we log
on
to a test account which has normal user permissions, the add-in also
appears
as it should. However, when the computer’s main user attempts to load the
add-in, it still doesn’t load. We’ve tried completely uninstalling and
reinstalling to no avail. We’ve also tried logging to a file when the
add-in
loads, but even this entry doesn’t show up, so it seems there must be some
setting/program on the user’s account which prevents the add-in from even
beginning the load process.

Our initial reaction was that VSTO or some other necessary dependencies
didn’t exist on the users’ computers, but the fact that the add-in works
on
all accounts except for a single user has killed that theory. What could
be
the cause of this?

Thanks,
Brian