Question: how to save mdb as accdb?
Answer: Click File, and then click Open.
Click the Access 2000 or Access 2002 - 2003 database (. mdb) that you want to convert. ... 
Click File, click Save As, and then click Save Database As.
Choose the Access file type, and then click Save As. ... 
In the Save As dialog box, type a file name in the File name box, and then click Save.