How to make a periodic notification of unread messages instead of a one-time?

Question

Skype

Hello!
I decided to expand the workspace and work in full screen mode, for this I made a hidden taskbar.
This method has a big minus: if I receive a letter or message and I don’t hear (let’s say I left), then the interlocutor will have to wait for my answer until I accidentally open the taskbar and see an icon in the tray about unread messages.
Interested in how to "force" to periodically remind you of unread messages in the following programs:
thunderbird
slack
skype
Thanks for any information

Answer 1

In Windows 10, old tray notifications are seen by the system as push notifications. Accordingly, go to the notification center and read. And no crutches.

Answer 2

Skype4COM.dll