See Also 
For Microsoft Windows versions prior to XP, a ListView control cannot display items in groups. For this reason, the sample code checks the OS version and OS feature-set. If the client OS is XP or later and the feature-set includes Themes, contacts are loaded into groups. Otherwise, the example code uses the IMessenger::MyContacts property to load the contacts directly into the ListView control without grouping.
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Application.EnableVisualStyles();
bool isRunningXPOrLater = OSFeature.Feature.IsPresent(OSFeature.Themes);
...
if (isRunningXPOrLater == true &&
OSFeature.Feature.IsPresent(OSFeature.Themes))
{
// contact group code
...
}
else
{
// contact list code
...
}
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