Your mail server certificate is invalid error

This is still happening on my Galaxy S7 edge using MS Outlook with a talktalk email address. So irritating........................................

MS needs to allow the app to support tls 1.0-1.1 again and give vendors time to switch over or vendors have to switch over now for the outlook app to work. 

You email host provider may not even know there is a problem or they may not know how to fix it.  If you are an end user, there is nothing you can do other than complain to both MS and your mail provider maybe one of them will take action to resolve.

Is anyone attempting to fix this on Microsoft's end?

Can someone from Microsoft at least chime in and let us know they are working to resolve this issue?

I now have to reach out to 30+ users in the field and walk them through the process of downloading/configuring/using an alternative email app.

Not cool Microsoft; not cool at all...

Asking our IT to change the server to make Outlook work on my Android is not an option.  This was a great thread for understanding that the problem is for me, not repairable. I have uninstalled Outlook and installed BlueMail.  It is working quite nicely, including the Exchange calendar interface.

Thanks for the mention of using BlueMail. I've just installed it and it's actually better than MS Outlook which I have now uninstalled on my S7 edge and waved bye bye to! 

Nice one !

Bluemail seems great with a tremendous amount more configurability and functionality.  Too bad they don't write office products or produce an email product for the desktop - would switch from outlook in an instant.

Someone at Microsoft should get fired for the last changes to Outlook for Android which stressed out many of use and forced us to do extra work for no reason but we can rest assured nothing will happen.