After installing Office 2010 on my computer (both laptop and desktop) running Windows 7 RTM, I had a problem opening any Office files stored in our SharePoint 2007 environment.  I would click on a file to open it or edit it, the Office 2010 application would open, however, the file wouldn’t open.

I could download the document to my desktop, open it, edit it, and re-uploaded it, but this fare far from ideal.  I could link the site to Colligo, but I don’t want to have connect to a site every time I want to open a document.

Finally, today I ran across this helpful string of comments on the TechNet forum –

In short, the solution is to make a fake proxy in IE:

  1. Open up Internet Explorer
  2. Click Tools –> Internet Options
  3. Click the Connections tab
  4. Click LAN settings
  5. Check Use a proxy server for your LAN (These settings will not apply to dial-up or VPN connections).
  6. Enter for the address
  7. Click Advanced
  8. In the Exceptions type: *.*
  9. Click OK, OK and OK

You should now be able to browse to a SharePoint site, click an Office document and have it successfully open in your Office 2010 client.  This successfully worked for me with MOSS and reports in the TechNet forum are that it works with WSSv3 as well.