I have an Task Pane addin/app which works fine in Office 365 desktop version. How can I test the app in Office Online? I haven't been able to find anything in the documentation.

Hi,

By Office Online, do you mean the online Office programs suite offered by Microsoft? If so, I'm afraid the add-in/app you used in Office desktop applications can't be used in Office Online.

Regards,

Steve Fan
TechNet Community Support

Thank you Steve, it's not the answer I wanted to hear :-).  I will checkout the OffCAT tool.

I will have to find someone at Microsoft who can get my Add-in/App into the online version of Word.  It's already available in the desktop version.  

Thanks again!

Adam