I originally posted about this issue almost a year ago. I provided Fiddler traces twice, and was promised escalation to support specialists several times. I have yet to receive a basic answer to my question
The issue is this: I've had a Passport / Live Id / Microsoft account for many, many years. I have all my Microsoft-related context associated with this account, including a Windows Phone, Windows and Windows Phone apps, lots of SkyDrive data, lots of contact and calendar entries, etc.
The main email address for this account is a @cornell.edu email address. This is an alumni address that basically forwards to another email address. Right now that's a gmail address, but I was hoping to change that.
Anyway, at one point in time I was suddenly unable to access Outlook.com. I started seeing the following error, which persists to this day:
This account can't be used to access Outlook.com