What do you mean how compatible is the language is? That question makes no sense to me because how compatible to what exactly? Are you asking how compatible is it to the newer VBA, well your version haves many older formulas so you can probably code what you have and it will still work with the new versions of Excel because they have all the old formulas and VBA in it plus new stuff. When you get your new computer or version of Excel it should work just fine with it. You need to google Mac Comparisons to Windows comparison. I have Office 365 and heard that the Mac version might be missing a couple of new formulas.