This has only happened in the last 2-3 months.

Windows Live Mail Calendar only works when I'm NOT signed in.

When I sign in again, having updated the Calendar offline, the (online) Calendar version freezes, and contains no entries.

If I am SIGNED OUT, I can't get access to my Address Book.

Is this because I have recently changed email address??  Where are the WLM parameters located?

Do I need to disable somewhere a dependency of WLM on my old address?

Any clues?