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Outlook COM Add-In not listed in "COM Add-Ins" menu

Posted on 2004-09-23
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Last Modified: 2012-08-14
Hi all,

I wrote Outlook COM Add-In that adds a custom toolbar to Outlook. It
was working fine, but few days ago, the custom toolbar just
disappeared. Suspecting my COM Add-In was being disabled, I opened
Outlook "Disabled Items" window to find that my COM Add-In was not
listed there. Then, I opened up "COM Add-Ins" window expecting to see
my COM Add-In being unchecked. However, my COM Add-In was not even
listed there! I even tried to register my COM Add-Ins manually by
using "regsvr32.exe", but still couldn't see my COM Add-In in "COM
Add-Ins" window.

I even searched system registry to make sure that COM Add-In object
was properly registered, and found nothing wrong. Can anyone please
tell me in what circumstance, an Outlook COM Add-In stops showing up?
Here is my system spec,

Windows XP/SP1
Outlook XP/SP1

Thanks!
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Question by:cgdrizzt
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LVL 16

Expert Comment

by:nonubik
ID: 12141084
Can you check whether under the registry key HKCU\software\microsoft\office\outlook\addins\ there is a key with your COM addin name with the following values:
Description, FriendlyName (both strings) and LoadBehavior (DWORD, if 3 means laod at startup).
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Author Comment

by:cgdrizzt
ID: 12145374
I found a registry key with COM Add-In name is successfully added under "HKCU\software\microsoft\office\outlook\addins\" key. I even searched HEKY_CLASSES_ROOT to make sure that my COM Add-In is properly registered in the system. My Add-In used to work fine, but all of sudden it just stopped working. I suspect that some security patches from Microsoft might be causing this problem. Here is my registry values under

[HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins\MyOutlookAddin.MyAddin]
"FriendlyName"="My Outlook Addin"
"Description"="My Outlook Addin"
"LoadBehavior"=dword:00000003
"CommandLineSafe"=dword:00000000
"AddInMon"=dword:00000001

Thanks
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LVL 16

Accepted Solution

by:
nonubik earned 125 total points
ID: 12168366
Hmm, this should be enough...
Try to re-register your COM addin
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