Summary:

• Window's Live Mail(WLM) 'Quick views' can 'break' when a folder is deleted in WLM(within an Account or under the Storage Folders), un-subscribing to a newsgroup, or by deletion of an RSS Feed.
• Common symptoms of a broken/corrupted 'Quick views'  are an inaccurate message counter; a failure to display current messages; or a failure to display messages received, copied, or moved since the corruption.
• To repair the Quick Views counter's functionality a registry edit is necessary(see Note of Caution below)

Repair Method:

1.  Close WLM
2.  Open Regedit
3.  Start/Run/Regedit
4.  Navigate(in the left hand pane) to the following location:
     HKEY_CURRENT_USER\Software\Microsoft\Windows Live Mail\
5.  Click on Windows Live Mail(left hand pane) to reveal the key's content
6.  Using the cursor/scroll bar(right hand pane) find the entry 'SearchFolderVersion'
    - This entry is in the field/column with a header titled 'Name'
7.  Click on 'SearchFolderVersion' to highlight that single key
8.  Delete the entry  'SearchFolderVersion'
9.  Close Regedit
10. Open WLM
    - the registry key will be recreated and WLM will poll for unread messages

Note of Caution: 

- Registry editing can create serious problems if used incorrectly. Proceed with the above at your own risk.

- For additional information about the using the Windows Registry Editor 

• How to Modify the Windows Registry

Revisions:

April 15, 2008: Original Published Date

May 12, 2008:  Additional reasons for 'Quick view' corruption added(thanks Ildhund)

May 24, 2008:  Windows Live Tags added