1. In the Save dialog, pull down the "Save in" list, click "My Network
Places" and select the server, then navigate to the desired folder.
2. In Windows Explorer, use the Tools > Map Network Drive command to
assign a drive letter to the server's folder. Then in Word you can
save to that "drive" just like any other.
3. Save the document to your local drive, close the document in Word,
and use Windows Explorer to copy or move it to the server.