Access to mySQL rarely works as both database types use a very different schema which leads to stability and other issues within your forum.
You can upsize the Access database from Access to SQL Server though which is normally more straight forward.
You would need to contact sales regarding your license, but being that old you would probably need to purchase an upgrade license.
Another alternative you may want to look into is having the forum hosted by us on our servers. The price includes the latest Premium Edition Brand-Free version of Web Wiz Forums and can also migrate across your old forum and convert it to SQL Server at the same time. Prices start from £3.99 per month and can be found through the link below:-
http://www.webwiz.net/webhosting/web_wiz_forums_hosting.asp