We have one Exchange user who complains that addresses in the auto complete list get broken very often.
As usual we advised him to clear the auto complete list in the File -> Options -> Mail section like we do for the rest of our users in case similar problem happens.
But that certain user keeps complaining that it solves the problem only for a short period of time (about a week), and the addresses start filling incorrectly again. He already tried clearing list few times and the problem keep coming back.
What circumstances might cause breaking the auto complete file so often?