ok, you need to use the calendar from Microsoft Hotmail.
First, create a hotmail account here via your computer.https://signup.live.com/
Once you have created an account, then on your phone.
On Start, flick left to the App list, tap Settings , and then tap Email+accounts.
Tap Add an account, and then tap Microsoft account (or Windows Live).
Enter your email address and password XXXXX from the account you just made, and then tap Sign in.
This will synch the calendar now to your phone.
Then on your computer, in outlook
Open Outlook 2013 on your computer.
Tap or click File, then tap or click Add Account.
Select Manually configure server settings or additional server types and tap or click Next.
Select Outlook.com or Exchange ActiveSync compatible service and click Next.
Enter your name, email address, and mail server as m.hotmail.com and tap or click Next.
Tap or click Calendar. New calendars will appear for your Microsoft account.
Tap or click the View tab, tap or click Change View, and then tap or click List.
Select your Outlook calendar events and appointments from the list view. Tap or click and drag (or copy and paste) the calendar entries to the calendar for your Microsoft account.
Your Outlook calendar entries are now copied into your Microsoft account, but you should continue to use this calendar in Outlook. All changes or additions will then be synced to your Microsoft account and your Windows Phone.
If you have any difficulties at all, please do not hesitate to let me know so I can assist you further