It depends -

If the code includes APIs it probably won't work (most APIs will need
adapting)
If the code contains any non built in ActiveX controls it won't work (so it
won't work if it's say a VB6 ComAddin)

If the code contains none of the above it will probably work, other than
anything that needs adapting for the Excel 2010 object model.

Regards,
Peter T

"jc" wrote in message
...
Our small company uses a very expensive compiled Excel Add-In to evaluate
convertible securities. The vendor of the add-in has stopped supporting
it,
so there will never be a 64-bit version. I am interested in migrating
quickly to Windows 7 64-bit and Office 2010 64-bit. What is the chance
that
the 32-bit compiled add-in will work / work well in this situation?
--
CroceJC