I'm an iPhone user, but I also have Microsoft accounts like Outlook, Office, etc. One day I was away from my PC. So I went to Outlook.com (web app)on my iPhone. I logged in and went to check my Calendar and it said set up Calendar on your device. I clicked the link and it took me to Windows.com. It told me instructions on how to set up my Calendar. The instructions were...

1. Tap Settings and then tap Mail,Contacts, Calendar.
2. Tap Add Account in the Accounts page.
3. Select Hotmail.
4. Enter your Outlook.com address and password.
5. Select the feilds that you want to sync. Tap Save

I followed the steps and then went back to the link the website provided. But its still telling me to set up my calendar. I have no clue on what to do so help me Microsoft Community! You made the thing for cryig out loud! is it because i have a POP3 account? Why cant you just make these apps on the AppStore!