Does Rmail 2.6 not work in 64 bit, Vista Ultimate. I upgraded to a new 64 bit computer and when I install it, the Rmail icon does not show up in the control panel. Does this qestion from Rbase website answer my question:
Q. R:BASE for DOS supports UDF's, so will this Plug-In work with DOS versions of R:BASE? A. No. R:Mail for R:BASE is a WIN32 Plug-In that is only supported in a Windows environment. Tom Hart

