Sharepoint 2007 Web Client

• First and formost change Network Provider order WebClient before Microsoft Windows-Network http://support.microsoft.com/kb/832161
• You cannot connect to a document library in Windows SharePoint Services 3.0 or Windows SharePoint Services 2.0 by using Windows shell commands or by using Explorer View
• Whitepaper - Understanding and Troubleshooting the SharePoint Explorer View
• UNC Password Prompt
  
  Apply the following registry change to the Client. Locate and click the following key in the registry:
  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters
  On the Edit menu, click Add Value, and then add the following registry value:
  Value name: DisableStrictNameCheckingData type: REG_DWORD
  Radix: DecimalValue: 1
  Quit Registry Editor.
  Restart your computer.