It varies probably since I'm not using the API correctly. Reference https://msdn.microsoft.com/en-us/library/office/ff868350.aspx for example:

$namespace->AddressLists->Item("Global Address List")->AddressEntries(
+"Lastname,Firstname")->PropertyAccessor->GetProperty("0x007D001E");
[download]

will give me a "Use of uninitialized value in printf ..." in my printf statement in the code from the OP.

Part of the issue is I'm trying to adapt VB, C#, etc.. any code example I can find really - into Perl Win32::OLE.