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There may be instances where your account, especially within Microsoft, references your UHV email address. This is to be expected and may continue to reflect the previous email address for some time to come.
This is most likely seen when you go to your Microsoft Account Profile. Your username may reflect @uhv.edu and be listed as an alias.
You should, however, continue to login with @tamuv.edu where appropriate, and will continue to send out emails as @tamuv.edu