Hello LornaEngland and welcome to the BlackBerry® Support Community Forums.
Sorry to hear you are having issues with your email on your BlackBerry® smartphone.
Did you recently change the password on this email account? If so, you need to update the password on your BlackBerry as well. The invalid error is usually caused by the password not being updated.
KB13137 How to re-validate Windows Live Hotmail, MSN, and Bell Sympatico email integrations will show you how to revalidate your email account.
Let me know if you have any further questions.
-HMthePirate
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