Why will my iphone calendar not synch with my mail account?

My iphone calendar suddenly went blank and has no appointments or anything that has been input on it.  I use yahoo as my mail, so I am not sure if that has something to do with it or not.  Please help!

You have to buy Mountain Lion 10.8.x, Lion (10.7.x) isn't broadly available. However before even considering upgrading find out why your iPhone will not sync. When you connect it to your iMac is it seen in iTunes?

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