Hi Rick you do like to test us out, this isn't an easy one!
It is possible through reg editing but there are lots of shortcuts that need replacing all related to poutlook.exe. The easiest way to do it is replace the existing calendar with ThumbCal, and change it's default by reg editing it to open in day view. Try the trial version to see if the edits below work first.
Just write the following in the calendar fields once ThumbCal has been installed:
"Program Files/ThumbCal/ThumbCal.exe -vd" (vd for day view)
I can't even guarantee this will work though!
There is a thread on it
here at xda developers, I hope this helps.

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Glofiish DX900, O2 Ignito (HTC Diamond), Glofiish V900, O2 Orbit 2 (Polaris), HTC Trinity, Advent 4213.
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