I need to figure out someone's login name for our domain, and I'd like to be able to do this from within Outlook 2010. I used to be able to do this from Outlook 2007 by right-clicking the user's name in an email message that they'd sent me, and clicking "Outlook Properties..." in the context menu. That would bring up this dialog, which contained what I need in the "alias" field:

Now I've installed Outlook 2010. I want to do the same thing, but I can't seem to find a corresponding field. First, I don't see an explicit "Outlook Properties" menu option anymore, and what I think is the corresponding dialog looks completely different:

It seems weird that, although I'm looking at the properties of my own name in the same email message in 2007 and 2010 in these screenshots, my name is shown differently in each -- Chris versus Christopher. That makes me think that Outlook isn't really looking in the same place to get this info in each case. So, can I get that "alias" field from within Outlook 2010?