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

Sending REST request to Outlook Mail endpoint for messages brings back email message object with properties such as: Subject, From, To, Body but it doesn't expose the MIME stream for the whole email. Actually this is required to save the entire email maybe as eml file locally or somewhere.
EWS exposes this option but unfortunately is hard limited to 1MB response (for JavaScript APIs).

hope this option will be available soon within the REST response

Thank you,

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

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.

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.

While reviewing the O365 Preview API I was wondering what about Task-Management. Currently there are two systems for task management (Exchange and SharePoint). Would be great to see a roadmap for TaskManagement in the O365 Story and of course get an API to easily connect Apps to consume tasks. (No CSOM required just give us REST :D)

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.

EWS / Outlook API non rest support the ability to request Free/Busy information about users. But in O365 REST APIs this functionality has been removed.

I know that Microsoft Graph / O365 API support suggestMeetingTimes which is helpful but when it comes to writing a scheduling application which contains displaying time slot information its nice to be able to get the general free-busy information.

It can be done through retrieving each users calendarView but in general its not necessary to see the entire meeting detail, but rather whether the person is free or busy during a time period.

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

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.

Need a Change Tracking API in Word.

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

In order to, for example, filter users by a certain skill you cannot do only one REST call now.

From stackexchange:

"Filter on collection type properties is represented as below:

https://graph.microsoft.com/v1.0/users?$filter=skills/any(c:c eq 'Javascript')

However, filter on skills property is currently not supported. You can place a request in uservoice site."

I would like support for this /any command, specifically for skills but for all queries would be great too.

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”.

It should not be necessary to require an admin consent to do Group read write operations through the graph API. There should be a permission for My Groups.