Can anyone tell me what service pack/version the .activePrinter property was introduced in for word?

I've developed an app on a machine with word 10 object library and it works fine but our build machine only has word 8. It'll build OK on that machine but when we come to run it on the test machine (which has word 2002 sp 2 so is pretty up to date) I get automation errors if I've accessed this property.

Any clues would be a great help.