Could this be a license problem?
Stefan or Mike: Can you help here? 

There never was a scalable "Helvetica" font in any version of SuSE
Linux. As far as I know, the rights for the real, scalable Helvetica
font are currently owned by Linotype and Adobe has licensed this
font. I have never seen that font and doubt that any Linux
distribution has it.

The packages xorg-x11-fonts-75dpi and xorg-x11-fonts-100dpi contain
bitmap fonts with the following XLFDs:

mfabian@magellan:~$ xlsfonts | grep helvetica-medium-r-normal.*iso10646-1
-adobe-helvetica-medium-r-normal--10-100-75-75-p-56-iso10646-1
-adobe-helvetica-medium-r-normal--11-80-100-100-p-56-iso10646-1
-adobe-helvetica-medium-r-normal--12-120-75-75-p-67-iso10646-1
-adobe-helvetica-medium-r-normal--14-100-100-100-p-76-iso10646-1
-adobe-helvetica-medium-r-normal--14-140-75-75-p-77-iso10646-1
-adobe-helvetica-medium-r-normal--17-120-100-100-p-88-iso10646-1
-adobe-helvetica-medium-r-normal--18-180-75-75-p-98-iso10646-1
-adobe-helvetica-medium-r-normal--20-140-100-100-p-100-iso10646-1
-adobe-helvetica-medium-r-normal--24-240-75-75-p-130-iso10646-1
-adobe-helvetica-medium-r-normal--25-180-100-100-p-130-iso10646-1
-adobe-helvetica-medium-r-normal--34-240-100-100-p-176-iso10646-1
-adobe-helvetica-medium-r-normal--8-80-75-75-p-46-iso10646-1
mfabian@magellan:~$

Via Xft2/fontconfig, these fonts are available in SuSE Linux 10.0 with
the family name "Adobe Helvetica" (not only "Helvetica").

But I cannot imagine that you want to use bitmap fonts for printing
from evolution. That would be far too ugly.

Closing as INVALID.