What Happened to My Calendar?

[mhunt3]

I was having issues with my TP2 so Sprint replaced it with a refurb. The phone looks and works great, but now it doesn't seem to have the HTC calendar on it. I can get to the standard WM calendar, but I really prefer the HTC version. I really don't want to hard reset because it takes me about 45 minutes to get my phone set up the way I like it. Any thoughts on how I might get the HTC calendar to work? BTW I have already tried a soft reset.