Convert an Access 2007 database to an earlier file format
Per
http://office.microsoft.com/en-us/access/HA102308221033.aspx
If you created a database in the Microsoft Office Access 2007 (.accdb) file format, but you want to share the database with people who are using earlier versions of Access, in most cases, you can convert the database to an earlier file format by using the Save As command. This article provides the steps for converting a database to an earlier file format and discusses some of the factors that prevent you from converting a database. (See web page)
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Compatibility pack does not include Access conversion
Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 file formats for Office 2000, Office XP, and Office 2003 users:
http://office.microsoft.com/en-us/products/HA101686761033.aspx
Download the Compatibility Pack here
http://office.microsoft.com/search/redir.aspx?AssetID=DC101298101033&CTT=5&Origin=HA101686761033