XMON causes Microsoft Exchange store.exe to consume up to 100% CPU resources. Only appears to happen twice a day for around 1 - 2 hrs and only on priv1.edb database. I have run eseutil /p, eseutil /d and isinteg –s server1 –fix –test alltests against the database but this did not stop it happening. Everything has been working fine since day 1, six months ago. This is a Small Business Server 2003 premium fully patched. Thanks for any help.