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As MS web site is saying
If your Microsoft account is unused for one year, your Microsoft account may expire, and you may need to reestablish a Microsoft account.
I would call RSC and talk to them about that to see what are the options available
In case you want to contact the regional service center This is the URL where you can find contact details: http://www.microsoft.com/learning/en/us/help/assisted-support.aspx
thanks
I am Supporting WP7 but please keep improving it MS.