inviting people to calendar events

I use Outlook.com as my email and generally enjoy it.  When I click on calendar, it goes to Hotmail calendar.  No biggie.  I guess they are related.  However, when I create a calender event and try to invite people from my "People" list, it tells me there are no people on the list.  If I click on the people tab from my Outlook inbox, it is fully populated.  I have no idea why the calendar app does not see the names in my people list.  Anyone else have this problem?

Thanks,

Darren