Microsoft Access database general specifications
Microsoft Access database (.mdb) file size 2 gigabytes. However, because your database can include linked tables in other files, its total size is limited only by available storage capacity.
Number of objects in a database 32,768
Modules (including forms and reports with the HasModule property set to True) 1,000
Number of characters in an object name 64
Number of characters in a password 14
Number of characters in a user name or group name 20
Number of concurrent users 255