Within Microsoft Outlook, you may encounter the error message: "Receiving reported error (0x80040600) Unknown Error 0x80040600." This error message indicates that the Outlook mail file has become corrupt. A mail client cannot store infinite amounts of information. Routinely, information needs to be compacted and/or archived. When information is not routinely discarded, compacted or archived - the mail file will become corrupt. When this occurs, the mail file needs to be repaired. Please perform the following steps to repair and then compact the mail file: Click Start - Run. If you are using Microsoft Outlook 2002, type: %ProgramFiles%\Common Files\System\Mapi\1033\ If you are using Microsoft Outlook 2003, type: %ProgramFiles%\Common Files\System\MSMAPI\1033\ If you are using Microsoft Outlook 2007, type: %ProgramFiles%\Microsoft Office\Office12\ If you are using Microsoft Outlook 2010, type: %ProgramFiles%\Microsoft Office\Office14\ Click OK. Double-c...