Tiny boxes
If I am understanding you, you want to read your appointments on a PocketPC while in a monthly view?
I don't know about your eyes, but with my Toshiba e740, I would have a box about .4 inches wide and .5 inches high per day, if I went with a 5 day view instead of a seven day. I think that with a font of 4pt. I might get all of 12 letters inside it. But I can't read that at all. I had to go up to 8pt. before I could make out words, which left me with five letters across.
There are ways you can put icons in those boxes to give you a better idea of what's on your plate "at a glance" but I don't think I have ever seen any software that tries to do what you want. Good luck, and of course many would be interested in what you do find to work.
Elena in Texas, USA