Good evening --

I wrote some VBA code for an Excel workbook, which I signed with a
self-created digital certificate. Since then, many people in our company
have migrated from Office 03 to Office 07, and some from XP to Vista.

Those who went to Office 07 don't have any problems, but those who also went
to Vista can no longer add the digital certificate (which worked on the same
workbook under XL2003/XP) to their trusted publishers. So the code doesn't
work for them, but the same workbook continues to work for everyone else just
fine.

Any ideas?

TIA