I know at one time or another everyone has ran into the problem of trying to figure out what versions of MS Office applications are compatible with older/newer versions. As simple as it seems, I often find myself confused about I/O with all the Office applications. Anyways, I ran into this nice little website by Lincoln University that compiled nice little tables to clarify this issue. Hope this info helps you or someone else who uses this stuff regularly.
Access
Excel
PowerPoint
Word
Full Site Here