Verify if a programm is installed

Hello,

I'm looking for a way to verify if Outlook 2010 is installed on my computer with a PowerShell script.

I have tried some ways with "Get-WmiObject -Class Win32_Product"and this tutorial.

I just find some MUI about Outlook and not the confirmation the software is really installed.
Thinking myself, I found "OUTLOOK.exe" in C:\Programmes\Microsoft Office\Office14. The problem is a .exe is not a good confirmation.

I really need something in PowerShell script which tells me Outlook is installed on the computer.

Thanks in advance,
Scanta