First off, go to the regsitry, regedit32
1. Click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. Locate, and then click the following registry entry:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\POP3Svc\Parameters\CheckPop3Tail
Note If the CheckPop3Tail registry value is not present, create it. To do so: a. Locate, and then click the following registry key:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\POP3Svc\Parameters
b. On the Edit menu, point to New, and then click DWORD Value.
c. Type CheckPop3Tail, and then press ENTER.
4. On the Edit menu, click Modify.
5. In the Value data box, type 1, and then click OK.
6. Quit Registry Editor.
If that doesnt work, just delete the users mail box and recreate it. These are both known issues with microsoft