Office 2010 has a very cool option to save files to the Windows Live SkyDrive. By choosing “Save and Send” from the File menu you can connect to your Windows Live SkyDrive as shown in the screenshot below.
After you click “Save As” you will get a normal Windows Explorer Save As dialog with the address in the address bar such as this one:
Copy this address, open the Windows Explorer, click on Computer and choose “Map network drive”
Now paste in the address you copied from above and choose the drive you would like to map it to