I have created a new database for the Customers in Microsoft Access 2010. Now my machine has a default format for Access 2007 where I am gonna use this database. So I have saved it as an accdb. Now the problem is when I am trying to open this database file from the Microsoft Access 2010 then it is not working. It says that "Unrecognized database format". What is the compatibility issue between Access 2007 and 2010. How can I solve this issue?