Calendar Sync problem

[Si.]

Hi,

For some reason my iPhone has stopped syncing calendar appointments, it was working fine yesterday but stopped yesterday night. I've tried replacing the calendar data on the phone but no luck, also tried turning calendar sync off, then back on again (doing a sync between) and still no luck.

Can anyone help?

Iphone is a 3gs running IOS5, Outlook is 2003.

 

[Si.]

Can anyone help?

I've tried a complete iPhone restore, and set it up as a new phone and it's syncing old calendar entries but nothing i add new, either on the phone or outlook.

 

[Deku]

You've chosen the correct iCloud calendar on the iPhone? The default is 3 different calendars and occasionally in the past my iPhone has switched back to the local calendar rather than the iCloud/MobileMe one.

 

[Si.]

I'm not syncing to iCloud.