I developed a customer tracking db, client/server, shared on 6-7 Windows 7 machines. The project started in the late 1990's on whatever version was out then and over the years, we upgraded and it now runs under Access 2003, still on Windows 7 machines. The owner now wants to upgrade the client machines to Windows 10 and Office 2007, while retaining Access 2003 on them to run his database. He does not want to make any changes to the existing program. What problems can he expect, if any?