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Outlook Addin does not show up after installation
#1 · November 27, 2025, 2:24 am
There might be few reasons for this. Please follow these instructions:
1. If you do not see the OfficeClip on the menubar, close all instances of outlook (check in task manager for outlook.exe and close it also).
2. Reopen Outlook from the Start Menu
3. If you still do not see the OfficeClip Add-In, go to the Outlook Trust Center and make sure that OfficeClip Add-In appears there and is not disabled. Outlook Trust Center can be reached from within Outlook. Please consult Outlook help file to go there.
4. Remove the extend.dat file, this file can be found at C:\Users\<your-login-id>\AppData\Local\Microsoft\Outlook or C:\Document and Settings\<user>\Local settings\Application data\Microsoft\Outlook for older OS
#2 · November 27, 2025, 2:26 am
Another way:
1. Verify that the add-in is not disabled in the registry (I presume you install it to HKCU) HKCU->Software->Microsoft->Office->Outlook->Addins->NAME. The LoadBehavior key should be 3. If it is anything else, change it to 3.
2. Start a cmd prompt.
3. Type: set VSTO_SUPPRESSDISPLAYALERTS=0
4. Launch Outlook from the command line shell (so that the environment variable is set).
5. During startup, you should get a UI box that pops up with some debug info about why it is failing to load.
6. Copy the error text from that box to the post here so we can help you further.
