Ok then next select Tools in the Options menu, then click the Advanced tab, and click the Maintenance button. Then make sure the Compact the database on shutdown every [100] runs is checked and change it from 100 to 1, and click OK, then OK again. Then close Windows Mail and when it will offer to compact messages click OK. Then open Windows Mail, go back to the Maintenance area and set the interval back to 100.
Let me know if you can then see the email again.
Choose Clean Up Now.
First try Reset.
Ok then next disable your antivirus software, especially the email scanner, and restart Windows Mail.
If your email does not appear after performing the above then follow the instructions at the link below to fix a corrupted email profile:
http://windows.microsoft.com/en-US/windows-vista/Fix-a-corrupted-user-profile
Computer Systems Engineer
Microsoft and Cisco Certified with 17 years experience, CISSP information security professional