While attempting to import an Access 2007 format database (*.ACCDB), you may receive an error such as: Unrecognized Database Format or Could not find installable ISAM. These errors can occur if you do not have the appropriate driver installed to import data from ACCDB files.
Importing Microsoft Access MDB databases into SQL Server is a built-in feature of SQL Server. However, because of the difference between the database engine of Microsoft Access 2007 and earlier versions of Microsoft Access, it is not possible to connect to the Access 2007 database using the built-in data source “Microsoft Access”. You can use this if you wish to import data from a MDB format, but not an ACCDB from Access 2007. For more information, check out Errors Importing Data from a Microsoft Access ACCDB Database Format into SQL Server.