For those that have Microsoft Access databases which they wish to use in OpenOffice, this is now supported. There is a wiki page that will give you more information here, however the most often asked question is answered as per the following:
Can I use Microsoft Access databases (.mdb) in Base?
On Windows: yes. You cannot open them directly via
File|Open, but you can access the data therein. For this, you need the Microsoft Data Access Components, which are available from Microsoft for free. (In Windows XP, they”re already included, so you need them for older Windows versions only.)