Do Office Add-ins always require Internet access to work?

Question

Let\'s take Excel for example. In Excel 2016, when I select an add-in in the STORE, after clicking on Trust It, will the code (.html,

Answer 1

Yes, the new Office add-ins are web-based. They are all defined - and installed - by a manifest file which specifies the URL location of the web source files. These are always hosted on the provider's web server and are not cached for offline use. The licensing system used by most add-ins (the ones that aren't free) requires a connection to the provider's web server which in turns needs to verify the user's license against the Office Verification Licensing Service. If offline use was enabled users could use a trial license in perpetuity without the provider being aware.