Since you apparently have access to multiple versions, try doing your development on the oldest one. Beyond that, if you're working on a more recent version and you're not sure when a particular feature was introduced, check the VBA help entry for it; often times there'll be an entry indicating which version it was introduced with. Regardless, you'll need to confirm your code actually works on all supported versions - in addition to features being added, features also sometimes get deprecated.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]