A family of Microsoft relational database management systems designed for ease of use.
I should note that traditionally one stores the actual document in a Shared Drive on the Server and only stores the path to said Drive in the database. The reason being storing the actual documents within the database does cause it to reach the 2 gig limit (Access) or the 10 gig limit (free SQL Server) more quickly.
All that said, the developer may be hesitant but I don't see any other choice besides the one I mentioned above.