Yes, it is possible to convert the older version Access Database like .adp or.mdb to newer version like .accdb. As there are such inbuilt feature in Access that allows you to convert an older access database file to newer format.
With the release of Access 2007 version the new file format is introduced i.e .accdb. This new database file format supports new feature which is not available in previous access version. Moving to newer version is good but what to do if your older Access database doesn’t support the newer version of Access. Don’t get worried, as you can easily correct this issue.
You can easily convert the Access 2000,2003 data format to Access 2007/2010/2013/2016 format databases. The accomplishment of database conversion is determined by the design and extent of macros and VB coding used in the database.
To know how this task to be performed, just check out the following link. But first of all check out your Access file format which you want to upgrade.