Latency issues and receiving error messages in Outlook.com “Sorry, there seems to be a problem with Hotmail right now”, “dub002.mail.live.com is down” or “The Service is Unavailable”

1. I'm receiving an error, "Sorry, there seems to be a problem with Hotmail right now"

I got an error: Sorry, there seems to be a problem with Hotmail right now. What you can do:

Try to return to Hotmail
If you're experiencing a problem that isn't shown, report your problem to Microsoft.

Update February 02/24/2013: Issue fixed.

2. I'm experiencing latency and receiving error messages while signing into my Outlook.com account.

Update February 25, 2013 01:05PM PST: Issue Fixed.

3. I'm receiving the error “The Service is Unavailable” when I try to add or edit my Twitter connections via Microsoft Account.

Update February 25, 2013 UTC: Ongoing Server maintenance.

4. dub002.mail.live.com is down

Update February 25, 2013 02:58PM PST: Issue Fixed.

Question about Outlook Express