This is how I got html messages in Notes 8.01 working in hardy,
nb, I'm using Firefox2, but this should work for both versions.
1) d/l xulrunner 1.8.0.4 into your /opt directory and untar
Code:
cd /opt/
sudo wget http://ftp.mozilla.org/pub/mozilla.org/xulrunner/releases/1.8.0.4/linux-i686/en-US/xulrunner-1.8.0.4.en-US.linux-i686.tar.gz
sudo tar -xzf xulrunner-1.8.0.4.en-US.linux-i686.tar.gz
2) Update the gre.d configuration to use the 1.8 xulrunner
Code:
cd /etc/gre.d/
sudo touch 1.8.conf
sudo nano 1.8.conf
3) Add the following lines to the file.
(use crtl-insert to paste in nano and ctrl-x to exit and save)
Code:
[1.8.0.4]
GRE_PATH=/opt/xulrunner
xulrunner=true
4) Export new MOZILLA_FIVE_HOME path
Code:
export MOZILLA_FIVE_HOME=/opt/xulrunner
Launch Notes and read your html messages
You can also create a launcher so you don't need to export the MOZILLA..
variable each time, before you start notes ..
Code:
--------start notes8.sh---------
#!/bin/bash
export MOZILLA_FIVE_HOME=/opt/xulrunner
/opt/ibm/lotus/notes/notes
--------end of notes8.sh--------
Optional steps that could be needed, but everything worked fine for me without them ..
Register the XULRunner to the system
Code:
Register XULRunner with the system by running xulrunner --register-global (to install for all users, must be run as root) or xulrunner --register-user (to install for one user only).
Hope this helps and works for you

Cheers,
Blues-.