The new Mail Apps make adding functionality to OWA very easy, however they lack some of the power of a full-on Outlook addin. I suspect that a common use case will be to create a full-powered addin, and a "lite" mail app that handles what it can for OWA. At present, this doesn't work because the mail app shows up in both. Furthermore, it is possible to create functionality that only applies to one client or the other. It should be possible to specify an app as belonging to OWA or to Outlook.72 votes
Thanks for your feedback! This is in our backlog but lower priority than a few other features. We’ll keep you posted with updates.
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