How to troubleshoot a VSTO addin that does not load?
The addin was not starting due to this other excel application running (I was migrating an MSAccess application to VSTO), so Access had an automation app open hidden.
office js - Why is my addin working in outlook classic but not in the ...
May 28, 2025 · I created a outlook addin following the samples in the microsoft documentation with the unified manifest. The addin works perfectly in outlook classic but in the new outlook, the ribbon …
Add-In Error: Content is blocked because it isn't signed by a valid ...
Mar 28, 2022 · The easy solution that worked for me was remove .office-addin-dev-cer from User folder. Then by running my Add-Ins by npm start I got popped by a message box to remove existing …
excel - Programmatically Install Add-In VBA - Stack Overflow
Jan 25, 2014 · .AddIns.Add "Filepath to addin in shared location", False Any ideas on why Excel is expecting the addin to be in the users default folder?
Outlook Add-In office 365 deployment > Add-In not visible
Dec 16, 2018 · I am trying to build my first Outlook Add-In (not VSTO) and followed the tutorial here. After setting up my Office 365 developer license/environment, I finally manage to compile/deploy the …
How do you enable excel add-ins for all users using registry (HKLM ...
Jun 24, 2022 · I'm trying to enable an excel add-in for all users in a given lab (Office 2019 is installed). The path to the add-in's "OPEN" string in the registry is …
Error deploying VSTO Office addin - Stack Overflow
Jan 10, 2015 · I found a workaround by installing the addin using MSI. This Guide was a lot of help. Taken from the section about registry settings for the msi installation: It is important to note the …
What is the difference between a COM Add in and a VSTO Add in
Jan 26, 2012 · I have not personally found a need to use AddIn-Express, but you may find it helps you if you don't want to invest the time in learning the VSTO framework. This choice also depends on the …
Newest 'outlook-addin' Questions - Stack Overflow
Oct 17, 2025 · In a Mobile Outlook Addin, what is a good replacement for the unsupported (on Mobile) function Office.context.mailbox.item.getAsFileAsync? *the function above gets the currenty open …
Unable to sideload the Office Add-in when running 'npm start'
Sep 1, 2019 · 2 For developers on Mac, it is recommended using Node Version Manager to install Node.js with the right permissions. Also, you need to make sure the certificate is installed correctly. …