hotmail inbox not visible

After log-in (using Safari) the following screen appears:

Er is momenteel een probleem met Hotmail
There is a problem with Hotmail

See attached file.
Still on my Windows-Firefox same hotmail-account opens no problem.

Reported this problem on this forum yesterday, tried the following since:

installed Firefox om Mac. Could enter hotmail-account twice, after that also Firefox gives the same error-screen. I have cleared all cookies and history - no effect.

A newly created hotmail-account on Mac opens fine - no problems...

Is this a known Hotmail-problem?

 

Yes, it works on my windows-based laptop with Firefox. It also opens on my Android mobile phone.

Tried opening same hotmail-account on more than one 'engine' (e.g. two laptops on Windows, or one Windows-laptop and Android mobile): no problem.

Any more suggestions?

It still does not work on Mac-Safari nor Mac-Firefox.