Very limiting.
I agree with Tony. My first db project was connecting an Access db to an ASP intranet web page a few years ago. I quickly realized that Access would only allow 10 simultaneous connections to the db which meant only 10 of our HR people could use the website at the same time. We ended up spending the extra money and upgrading to MS SQL Server due to connection limitations. I'm not sure of the current connection limitations on Access, but I'd stay away from it if you plan to grow your db.