I've been create one add-in that gives support to clients when reading emails. The question is there a way to pin the add-in like the Insight add-in to keep helping the client as they open emails?
If you are creating an Outlook web add-in, this is possible by adding a pinnable task pane to your add-in manifest.
Please see the linked documentation for the full XML. If you already have a task pane, you can add the SupportsPinning
element to it.
<Action xsi:type="ShowTaskpane">
<SourceLocation resid="readTaskPaneUrl" />
<SupportsPinning>true</SupportsPinning>
</Action>
It's also important to implement a handler for the ItemChanged event so your add-in can show updated information when the user selects a different message.