I have Win 10 on a desktop PC, and trouble with Windows Live Mail.  Suddenly I cannot send or receive.  This happen before recently, I received some good information here, and I fixed my problem.  Now it has happened again.  Here is the error message:

Server Error: 0x800CCC90

Server Response: -ERR [SYS/TEMP] Server error - Please try again later.

Server: 'inbound.att.net'

Windows Live Mail Error ID: 0x800CCC92

Protocol: POP3

Port: 995

Secure(SSL): Yes