Office 365 shared mailboxes are very useful. Unfortunately, they do not load outlook web add-ins right now: see http://stackoverflow.com/questions/35059067/make-outlook-add-ins-working-with-office-365-shared-mailboxes/35065215
This would be terrific to have add-ins for such mailboxes especially for all CRMs related apps

Would like to have an ItemSend event in the web API just like the regular API does. Is that on the planning stage for future releases?

Currently, the requiredAttendees methods setAsync and getAsync have serious issues when resources of room type are used. I will add below my review of the three methods exposed on requiredAttendees object (picture in the link):

http://s17.postimg.org/satnvyrz3/Required_Attendees_Calls_Behavior.png

Build out the specific host PowerPoint API with near complete parity to the control that was available in VSTO add-ins for PowerPoint. We have an add-in we want to build out in the new Web Add-in platform, but can't due to the extremely limited capabilities of the current Office.js API. You've had years to work on it, at least be more forth coming with where things are in development.

Add User Defined function support to the Apps for Office Excel APIs so that users can enter formulas in excel. User Defined Functions are one of the most powerful features of Excel (and some competitor spreadsheets products now available in the web). They are critical for us to make our Apps for Office product as powerful as our legacy on premise product.

At the moment Word runs Add-ins in IE11

IE11 doesnt support ES2016, and is therefore much harder to develop for than all of the other newer browsers (Safari, Chrome, Edge).

Word should run Add-ins in Edge

The following list of events found on the client version of Word and Excel would aid in development of apps that work the same as current client addin apps work.

Excel Open Event
Excel Close Event
Excel BeforeClose Event
Workbook activate event

Word Open Event
Word Close Event
Word beforeClose event
Document activate event

Footnotes are very heavily used in many professional types of documents. (Specifically legal documents). Currently Footnotes are not exposed in any way via the word api which is a sizable gap in the functionality.

Need a Change Tracking API in Word.

Make it possible for developers to set a standard width for task pane apps.

By default each procedure should only have the first procedure line (header) visible with an expand button to show all lines within the procedure. Currently a lot of time is spend scrolling through code.

I would also like to see the two drop downs for general and declarations changed to a tree view on the left so that I can more easily navigate procedures and methods.

Support wildcards for AppDomains in Office add-in manifests to support sub domains for example <AppDomain>https://*.acme.com</AppDomain>

Currently an add-in command will disable if multiple Outlook mail items are selected. It would be really useful to be able run certain commands by iterating over a collection of the selected items.

Make it possible to use setSelectedDataAsync with data type “HTML” and “Office Open XML” in PowerPoint. Currently it is only Word that can use data type “HTML” and “Office Open XML”.

Please improve the dialog, it should allow to:
- set modality (right now the dialog is not modal!)
- have bidirectional communication, i.e. to have possibility to pass information directly from dialog to task pane and vice versa.

There are many use cases valid for both requirements:
- when you need to retrieve data from task pane (e.g. lazy loading)
- you have html where you fill the content, right now you need to pass them in URL which is not really nice solution.

At present, if there are tracked deletions within a word, that word will not be found by search if either MatchWholeWord or Wildcards are turned on. This is a bug in search, but it is especially crucial to fix for add-ins.

As referred to the post:
https://social.msdn.microsoft.com/Forums/office/en-US/720a1bd6-abb9-4f75-863f-1fc33256a629/is-there-an-event-for-when-recipients-change-in-outlook-2013?forum=appsforoffice

there is no event JavaScript API an add-in for Outlook could use to react to a change in email message being written (compose mode).
For example if the user adds further To, Cc or Bcc Addresses, it would be advantageous if the add-in could react to it and display relevant data.

We have a requirement to load a workbook from a remote source from within the add-in. User logs in, selects from a list and workbook template loads.

With the Word JS API we can load a template remotely using an AJAX call that returns the workbook as a base64 string and then insert the response into the current workbook using the replace option. AFAIK this doesn't exist for the Excel API and we download the workbook and then instruct the user to open from the download pane.

Wrap the native Skype Android and iOS SDK's to allow using Skype for Business in Xamarin apps.

Preferably also offer a Xamarin Forms component to use Skype in cross-platform Forms app code for Android and iOS.

The Xamarin community is going to do this anyway but a Microsoft supported solution would be better, esp since Xamarin is now part of Microsoft.