Oulook.com There is a problem with this website's security

My Partner and I are unable to log on to outlook/hotmail web mail.
We keep getting the following message:



Is this anything I should be worried about or is it just a problem with the web server and I should not worry?

Thanks

Hmm. According to Firefox:

dub002.mail.live.com uses an invalid security certificate.

The certificate is only valid for www.airbnb.com

(Error code: ssl_error_bad_cert_domain)

Click to expand...

( I typed in a URL of Outlook.com and it redirected to dub002.mail.live.com). I'd suggest something's up with it.