The printing emails feature will come in very handy - I still have to print out ones from my sister for the non computer literate old folks. I currently have to do it by copying in to Techwriter and changing the fonts of the header and signature (or they only ask why she's written that bit!)
Since version 4 was released there has been a huge number of improvements, I'm now using the built in editor rather than Zap Email, as it visually highlights spelling mistakes, so further enhancements in version 5 are very welcome.
This means no one should be coming home from Wakefield without at least two pieces of major updated software.