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Hi Bob !
Please follow the instructions in below Wiki to change the Email ID associated with your MSDN / TechNet Profile.
http://social.technet.microsoft.com/wiki/contents/articles/4806.how-to-request-your-email-or-live-id-changed-on-an-msdn-or-technet-profile.aspx
You can always swap between Profile but currently Merge Profile feature is not available.
Please let me know if this helps. Hopefully i have answered you correctly. Thanks, Hasham Niaz