Calander sharing is greyed out and I am unable to find a way to get past this. Is there another way I can share my calender with other people and sync with my iphone etc. The other people need to be able to be able to add and edit the calender as well.Please help

Sharing might have been disabled on the company level, so check with your administrators. Another possibility is that you are trying to share a Calendar you do not own, such as one from a shared mailbox, etc.