How to add Custom Mail Action that open add-in Task Pane in OWA (Email Read Mode)
I would like to implement custom Mail Action that will open Task Pane. I know that it's possible as some add-ins have it. Below is an example of Custom Mail Action and Task Pane.
I know how to add horizontal task pane to the add-in, but I need to add it vertical to the right as in the screenshot.
There are a few similar questions on StackOverflow but they all tell it's impossible to implement. As you can see on the image some add-ins like Evernote, Wunderlist has this functionality.
We just announced at Ignite conference that add-in commands will be rolling out to all users and all add-ins for Outlook web (Outlook.com, Office 365 and OWA on Exchange 2016 on-prem) over the next 2 months. With that feature, you'll be able to have buttons in OWA that launch task pane, as you see in the screenshot.
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