I've never used that app so I can't tell you how well it works.
The difference between stupidity and genius is that genius has its limits. When you take things for granted, the things you are granted, get taken. Even a mosquito doesn't get a pat on the back until it starts to work.
[GroupWise 7.0.3 / BES 4.1.6 MR 5]
when we install, we can see the amount of memory disappearing.
OR,
go to desktop manager, manage application. There should show.
(i did the below)
if not, do a full backup (incl. 3rd part app) and see the size of the theme. It will show as individual files and can see the size from there.