Overview The 64bit version of office 2010 leaves us a bit wanting. For those users that uninstall Office 2007 and install the new 64 bit addition, a host of feature will not work without the addition of the 2007 Office System Driver Data Connectivity components. Here are the details on what is supported: http://technet.microsoft.com/en-us/library/cc263526.aspx “Datasheet view Requires a 64-bit ActiveX control. Microsoft Office 2010 does not provide a 64-bit version of this control.” Resolution Download and install the 2007 Office System Driver: Data Connectivity Components http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=7554f536-8c28-4598-9b72-ef94e038c891 The 2010 component can be found at Microsoft at: http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=10910