You're as insane as I am :)
I've just setup OST on W2k8R2 & IIS 7.5, seems to be working fine.
Add IIS + CGI role
MySql follow
http://www.thewebhostinghero.com/tutorials/install-iis7-php5-mysql5-win2008server-pt3.html(http://www.thewebhostinghero.com/tutorials/install-iis7-php5-mysql5-win2008server-pt3.html)
http://www.thewebhostinghero.com/tutorials/install-iis7-php5-mysql5-win2008server-pt2.html(http://www.thewebhostinghero.com/tutorials/install-iis7-php5-mysql5-win2008server-pt2.html)
Php 5.4.0 download & install from http://www.microsoft.com/web/downloads/platform.aspx(http://www.microsoft.com/web/downloads/platform.aspx) Don't bother with the PHP install guide from the mysql links.
There are newer versions of sql & php but this is the quickest way to get up and running.
If you have an error with osTicket saying something about short tags, modify php.ini in C:\program files\php\5.4
Short_open_tag = On
Hope this helps!