Xrm.Page.context.client.getClient() returns "Web" when called from Outlook App

Hi,

The Xrm.Page.context.client.getClient() function does not seem to be working correctly. When called from the desktop Outlook App, it returns "Web", instead of "Outlook" as described by the documentation (https://msdn.microsoft.com/en-us/library/gg334511.aspx#BKMK_getclient). Here is the code I am using (bound to form onLoad event):

function alertClient() {
var client = Xrm.Page.context.client.getClient();
Xrm.Utility.alertDialog(client);
}

Any ideas on why this is happening?