This is copied from django-mssql but I'd be okay with it, although in my mind "Microsoft" is the vendor, not "SQL Server." Of course this could be problematic as Microsoft might have several database offerings.
Yes, MS Access comes to mind. We have the precedent of Oracle, which is both a company name and a product. As for me, the database product name makes more sense for the vendor property. But I wouldn't fight for it.