thanks
1. Right-click your task bar.
2. Choose "Properties".
3. Select the "Taskbar" tab.
4. In the "Notification Area" section, click the "Customize" button.
5. For "Microsoft Office Document Cache", choose "Hide Icon and
Notifications".
Read here:
http://tipshare.blogspot.com/2010/02/how-to-remove-office-upload-center-icon.html