Bear in mind RFC 1958 section 3. In particular, some
handheld devices (such as the one this message is
being composed on) might not have sufficient
resources to support some of the more recent
Unicode implementations. Aside from font issues,
Unicode normalization uses huge tables which might
not be practical for some devices which do support
email. Therefore transcoding a space- and
memory-efficient charset into Unicode may well
render the transformed message unusable or
unreplyable if transferred (forwarded, etc.) to
some devices [it is not unusual for mail to be forwarded to PDAs, mobile
phones, pagers, etc.].