ACCDB file is a database file format used by default by Microsoft Access 2007 and later. Data stored in ACCDB file is organized into tables and fields that can include SQL queries, custom forms, and other data specific to given database software.

ACCDB format as the successor to MDB format

ACCDB format is the successor to older format MDB, which was considered standard Access format before the release of Access 2007. New format offered some additional features, such as support for multivalue files, data macros, database encryption, or ability to store atachments and binary data. Along with ACCDB format developers introduced solutions such as integration with other Microsoft products (Outlook and SharePoint) not possible before due to security vulnerabilities present in earlier format. The newer format, however, doesn’t support some of the older functions, including replication and user-level security policy.

ACCDB and additional LACCDB file

During work with ACCDB file in MS Access a database lock file (LACCDB) is automatically generated in the same folder as the ACCDB file. Lock files prevent any attempts to modify the original database file. Locking features are especially useful if more users are working with the same file simultaneously.