NDBC wrote:
Again, I've written vba code controlling forms etc in Excel 2003. I haven't
tried it but I'm assuming it will work on newer versions of Excel. Is this
correct or an I heading into problems when I upgrade Excel.

It is safer to expect that it won't work on XL2007 without at least some
modifications. Very simple VBA code might be OK but anything involving
shapes or charts requires rework before it will behave sensibly.

Previous upgrades since XL97 through to XL2003 have been relatively
painless with a very high degree of forwards compatibility.

XL2007 is gratuitously incompatible in arbitrary ways.

Regards,
Martin Brown