Iphone has deleted calender events but they are still showing on hotmail

I have the Iphone 4 running on IOS6. I don't know if it has anything to do with the update but I have noticed all my calendar events have disappeared on my phone! I have not changed any settings on my phone for this to happen. Luckily, I can see that the events are still showing when I log into hotmail and click on calendar. Here is what my settings currently show:

Default Calendar is set to Hotmail

Sync = 'All Events'

Under Hotmail Accounts Calendars is Turned On

Mail Days to Sync - No Limit

Icloud Calendars is turned off. I have never Synced my Calendar to Icloud, I have tried switching this on but not much happened.

Any help would be much appreciated.