0x80040600. And an error message : An unknown error has

Hi,

Follow the below steps when you get the error 0x80040600, when you try to send and receive message:
Run the Inbox Repair Tool to diagnose and repair errors
To recover your data, you must first run the Inbox Repair Tool.

Note If you are using Outlook 2002 or if you are using a .pst file in Outlook 2003 that was created in an earlier version, the Inbox Repair Tool may not work if your .pst file has approached the 2-GB size limit. Therefore, check the file size before you continue. Depending on your Windows version, your .pst file might be located in one of the following folders.

Windows Vista: disk drive:\users\username\AppData\Local\Microsoft\Outlook

To run the Inbox Repair Tool, follow these steps:

   1. Exit Outlook.
   2. Make sure that the Show hidden files and folders option is enabled in your folder options. The Scanpst.exe is a hidden file on your computer, and you might be unable to locate it if this setting is not enabled. To check this setting, follow these steps:
         1. a. Click Start, and then click Run.

            Note If you are using Windows Vista, use the Start Search box.
         2. Type Control Folders, and then click OK.

            Note If you are using Windows Vista, right-click Control Folders, and then click Run as administrator.
         3. If you are using Windows Vista, double-click Folder Options.
         4. Click the View tab.
         5. Under Hidden files and folders, make sure the Show hidden files and folders option is selected, and then click OK.
   3. Click Start, and then click Find or Search, depending on which version of Windows that you are running.
   4. In the search box, type Scanpst.exe. If you cannot find the Scanpst.exe file by using Find or Search, try to locate the file manually. Check the following locations for the file. Where the file is located depends on which version of Windows you are using:
          * disk drive:\Program Files\Microsoft Office\OFFICE12
          * disk drive:\Program Files\Common Files\System\Mapi\1033\
          * disk drive:\Program Files\Common Files\System\Mapi\1033\NT
          * disk drive:\Program Files\Common Files\System\MSMAPI\1033
          * disk drive:\Program Files(x86)\Microsoft Office\Office12
          * disk drive:\Program Files(x86)\Common Files\System\Mapi\1033\
          * disk drive:\Program Files(x86)\Common Files\System\MSMAPI\1033
   5. Double-click the Scanpst.exe file to open the program.
   6. Click Browse to locate the .pst file.
          * Windows 98 or Windows Me: disk drive\Windows\ Local Settings\Application Data
          * Windows NT 4.0: disk drive\WINNT\Profiles\username\Local Settings\Application Data
          * Windows XP or Windows Server 2003: disk drive:\Documents and Settings\username\Local Settings\Application Data\Microsoft\Outlook
          * Windows Vista: disk disk drive:\users\username\AppData\Local\Microsoft\Outlook
      Note If your operating system is not listed or if you cannot find the file, see the Help provided with Outlook.
   7. Click Start. The Inbox Repair Tool scans the file and reports whether it found any errors.
   8. Click OK.

Source: http://support.microsoft.com/kb/814441