Data Validation support is a key feature requirement for using Office Apps for OLTP systems.
The main idea is to fill the gap between VSTO features and Office Apps. This will help in easy portability of VSTO based apps to Office apps.16 votes
Thank you for the feedback! This is in our backlog and we plan to implement the API in the near future.
As always, when the design draft is ready, we’ll present design for review under the open-spec branches of this repository: https://github.com/officedev/office-js-docs.
Office Extensibility Team
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.105 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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