Consider the following scenario:

• On a Windows Vista-based or Windows Server 2008-based computer, you configure a proxy server in Windows Internet Explorer.
• You use the Web Distributed Authoring and Versioning (WebDav) protocol to access a Microsoft Office SharePoint Server site.

In this scenario, you are prompted unexpectedly to enter your credentials three times. However, you expect that you can access the site directly.

For example, you are prompted to enter your credentials three times when the following conditions are true:

• You open a Microsoft Office file from a SharePoint Server site.
• To open the file, you use a 2007 Microsoft Office system program on a Windows Vista-based client computer that has a proxy server configured.

Note: This problem does not occur on a Windows XP-based computer.

Consider the following scenario. You use Windows Internet Explorer to visit a Microsoft Office SharePoint Portal Server site. When you select Explorer View on the site, a WebDAV PROPFIND request is sent. However, an extra forward slash mark (/) is appended to the query path in the WebDAV PROPFIND request.

Because of this behavior, the request may be blocked by some firewalls, or it may be routed to the wrong server. In this scenario, you cannot access the correct resource.

This problem may occur in the following Microsoft Windows operating systems:

• Windows XP
• Windows Vista
• Windows Server 2008

Consider the following scenario. You try to save a Microsoft Office Excel 2007 workbook to a document library on a Microsoft Windows SharePoint Services site. The workbook is not saved as expected. If you make a change in the workbook and then try the save it again, the workbook appears to save as expected. The file name that you specified appears in the title bar of the workbook. However, when you exit Excel, you are not prompted to save the changes to the workbook. In this scenario, the workbook is not saved, and the contents of the workbook are lost.