Customer support issue: Installing Silverlight on the Mac

I was just dealing with an escalated end-user problem with a production Silverlight application here at *nameless* Fortune 500:

User:  I can't get your Silverlight app to install on my "new" Mac.

Support: What browser and OS version are you running.

User: I'm using Safari on a G5 tower running OSX 10 something.

Me:  Um... The G5 is a PowerPC based computer.  Apple announced their retirement in 2005, hasn't sold them since early 2006, and the current version of OSX doesn't install on them...  And no, Silverlight doesn't run on them either...

Sorry...