Email Address Already Exists?

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Hi,

A user has left - been deleted - now when another user sends a meeting notification we're getting bounce backs stating that the this user doesn't exist - I've tried to recreate her and hide her as a work around, but keep getting...

c10312e7 - this email address already exists in this organization....

and

Disabled user <user name> does not have a master account SID. Please use Active Directory MMC to set an active account as this user's master account.

event id 9548

in the event viewer...

Help!

 

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Sorry found which account had the email address - will update if the no such user messages keep happening.