see this link:
http://office.microsoft.com/en-us/access-help/access-2010-specifications-HA010341462.aspxNOTE: Although the maximum size for a single database file is 2GB, you can work around this limitation by using a split database. A front-end (Access) database file can point to thousands of (Access) back-end database files, each of which could be as large as 2GB. For more information, see the topic, Split a database.