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.

Online Add in features need to be enhanced to have ability to resize Task Pane in Word online, Mac and IPad.

iPad also has limited resize ability and hence taskpane resize is needed

Currently, No Support to access Footnotes and Endnotes using JavaScript API. Please add support for search in foot notes and end notes.

Need a Change Tracking API in Word.

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

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.

As you are supporting so many document events for Getting and
Setting the Data using office.js
Hence we are developing office apps 90% code using Jquery and javascript,but not all the events are supported that supported by Jquery.

I need some drag and drop kind facility for dropping "ooxml" kind of data to docuement.

Create a angular component library for the office UI fabric. There is currently a library for Angular JS and React, but not for modern versions of Angular.

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

Support Add-in development in Blazor

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.

According to this...

https://docs.microsoft.com/en-gb/office/dev/add-ins/reference/manifest/extensionpoint#extension-points-for-outlook

...Addins are only supported for message read, on mobile. Can we please have a MobileMessageReadCommandSurface ExtensionPoint, so that we may create an addin for message compose, on mobile.

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 would be very useful if add-ins dropdown menu could contain dynamically generated items. Now the displayed content in the ribbon dropdown need to be hardcoded even for sub-menus which limit the capabilities of add-ins commands.
See question on stackoverflow
http://stackoverflow.com/questions/36315571/dynamic-content-in-add-in-command-with-ribbon-dropdown-menu

Our very successful commercial Outlook add-in ePredict for SharePoint (http://ww3w.docauto.com/product/epredict-for-sharepoint) automatically launches its UI in the task pane in desktop versions of Outlook. Our customers are interested in a version for Office 365 Outlook online. However, Office 365 Outlook online requires user input to launch a task pane add-in. Our users would not accept this. Please add functionality, probably in the manifest, that would allow a user to give permission to an add-in to automatically launch in the task pane when an existing email is opened or a new email is being created. Thanks!

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.

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.

Currently only content controls of type RichText are support (see https://dev.office.com/reference/add-ins/word/contentcontrol). Please add support for other types, specially BuildingBlockGallery, CheckBox and ComboBox