In bug 5642 we investigated how the HTML5 client works in Edge as is. This bug is about updating documentation and tracking what other bugs we need to fix before officially supporting the browser.
In the prioritization discussion for bug 5652, we also decided that we will put this bug on the same milestone.
Bugs, so far, related to Microsoft Edge:
No local cursor (bug 5779)
Keyboard issues (bug 5135)
And see bug 5787 for support of Microsoft Edge on Windows Mobile.
Documentation updated with information that we have tested on Microsoft Edge. This documentation was added in revision 34542.
Checked the admin guide under section 8.7. and Microsoft Edge is now listed there.