>I thought about that as I realise there are probably VFP versions of it too.
>The version I have came on the FPW26 workgroup extensions disks so I know it's the right one.

For some reason Foxpro doesn't agree with you :)
Did you copied requred DLL's into windows system directory?
Delete foxmail.fxp and try to issue SET LIBRARY with fully qualified name

SET LIBRARY TO C:\mypath\foxmail.fll

It's also possible that it just doesn't work under Win95/98 and so on.