have exhaustive knowledge of the syntax for earlier versions

or

test with earlier versions. Either yourself or get someone to do it for you

--
Regards,
Tom Ogilvy



"mike" <dingasm@worldnet.att.net> wrote in message
news:1123256353.266401.46760@g43g2000cwa.googlegroups.com...
> How can I determine the backward compatability of my VB code. I've
> tested with Excel 2000 and 2003 but no longer have access to earlier
> versions.
>