Adobe makes it sound easy to do (Adobe ID and Membership FAQ):
Quote:
My e-mail address has changed. How do I update my membership?
Sign in, select Account Details, and click the Change button next to your e-mail address. Once you have entered the new e-mail address click the Update button to save your changes.
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Did you try this? My impression is that the ID isn't actually your e-mail address, you just need the e-mail address to access the account.