Accept e-mail calendar requests? Is there a way (app, configuration, etc) that will allow me to accept e-mail calendar requests sent to a POP3 account?  The request could be iCal or could originate from Exchange or Outlook.  Once accepted, I would like them to be added to my calendar.
Yes, support for this is native in Android.

I have an Exchange account added to my phone (Settings > Accounts &amp; Sync > Add account). Once I snyc'd email and calendar I was able to receive meeting requests through the Mail application, accept them, and then see them show up in my calendar with a different color. The way Google handles Exchange is really sweet.

Update:

So I played around a bit and here is what I found. From the gmail app on the phone you cannot accept appts. But, not sure how it works with iCal and such, I just sent myself a meeting notice from my Exchange Outlook calendar to my gmail account. I signed into Gmail from my computer, got the invite, I clicked yes I am attending, and it now shows on my calendar.

So from the gamil app it appears we cannot accept invites but from a computer we can. :(