Is there any configuration in central deployment or in the manifest to target the excel add-in appears only for thin client (excel online), not for the desktop excel ?

Like webpages get cached, modern Office Web Add-ins should also be enabled to work offline. If developers wish, they can use browser capabilities (like web workers) to build Office Add-ins that would support working offline. The ask here is that Microsoft clearly outlines the way developers can build offline functionality into their Office Add-ins and that this will be supported as a core feature for Office Add-ins in the future.

When a user resizes the add-in task pane and saves the document, the width of the task pane is stored in the document specifically in /word/webextensions/taskpanes.xml. However, when the document is reopened, and the add-in is reloaded, the officeJS task pane ignores the value of the width attribute stored in the document. The task pane is always displayed with the same fixed size.

It is important for our add-in to maintain its width because of the nature of the content that must be shown in the add-in.

Please see the details in
https://github.com/OfficeDev/office-js/issues/1629

Organizations often have existing security groups they would want to use for deploying Add-ins. But the current restrictions on what groups work for centralized deployment often force organizations to start (and maintain) a new dedicated security group for deploying Add-ins. This would be unnecessary if all types of security groups (especially nested or dynamic groups) would be supported in a centralized deployment scenario.

We want to provide links to our users to documents associated with their group.

The existing api (https://docs.microsoft.com/en-us/javascript/api/office/office.document?view=word-js-preview#getFilePropertiesAsyncoptions__callback) provides download links, which are not suitable because we expect our users to collaborate within their group and passing static documents around does not meet thier needs.

So we want either the sourceDoc id (As seems to be provided in the VB api https://docs.microsoft.com/en-us/office/vba/api/access.objectframe.sourcedoc) so that we can construct that url for them...

or the actual web link of the document itself.

Related github issues that illustrate the problem
https://github.com/OfficeDev/office-js/issues/1098
https://github.com/OfficeDev/office-js/issues/831

enable API development for the latest exchange on-premise version (2019) and need properties like <SupportsSharedFolders> to enable Outlook Add-Ins on shared calendar

Many users use Outlook as their E-mail client for multiple accounts, including non-Exchange accounts. The usefulness of Add-ins, and as a result Outlook, is greatly diminished if they can only be used with Exchange connected accounts. Please add support for IMAP accounts and Gmail to enhance the usefulness of Outlook Add-ins and expand the reach of Outlook in general.

This functionality was the main reason we started using actionable items in emails. This allowed you to be able to switch back and fourth between the email behind the card and the card. Maybe it would be better to call it something like "See Accompanied Message".

Add-in only show on the email surface at the time of install through the App Store inside of Outlook Web, or using the Customise Actions pane in Outlook.
We want to show on the email surface without installing through the App Store, or using the Customise Actions pane. And also we want this when some administrator install the add-in for overall of its tenant.
This is important because Outlook for web users are difficult to find the add-in.

Support Add-ins deployment to users for OneNote in Microsot O365 Admin Center. (Currently only available for Word, Excel, PowerPoint and Outlook)

Support Add-in development in Blazor

Please add support for Office Add-Ins using Blazor Webassembly

Possibility to use C# for Office Add-ins development is very important for us. Blazor would be Great

Sometimes when more than one workbook is opened, then a:
GeneralException: There was an internal error while processing the request
is thrown during various office-js operations.

See https://github.com/OfficeDev/office-js/issues/771 for details.

I know there's a workaround:
https://docs.microsoft.com/en-us/office/troubleshoot/excel/force-excel-to-open-new-instance
but it's impossible to force clients to use it.

☆ It would be nice to add a setting that allows you to specify a transfer-prohibited address or domain.
☆ It is hoped that Power Automate can take over the transport rules of Exchange Online.

I am trying to create an event to know what content control is selected. Alex Jerabek told me that "onSelectionChanged" could be useful but it is still in BETA. So I would like to ask you implement these events and release them.
Thank you very much for your time.