Lost Calendar info

I've had some problems keeping my calendars in sync from Mac to iPhone and iPad. Now I have lost some information from my calendar on my Mac. If I do a mobileme sync will I then lose the information stored on mobileme or will I get it back from mobileme?

Could go either way. If data is disappearing by itself that suggests you have a corrupt calendar file on one or more of your devices. With corrupt data, things do not always behave as they are supposed to.
If there is information on MobileMe that you want that is not anywhere else, you can login as a new user on your Mac, go to Apple > System Preferences > MobileMe > Sync > Advanced > Reset Sync Data and reset the sync data from MobileMe down to the computer. This will pull a copy of whatever is on MobileMe down to the new user.
You can then use the File > Export > Export option to take that calendar out of iCal and put it in your normal user.
Once you have the data you want back in your calendar you can then follow http://docs.info.apple.com/article.html?path=Mac/10.6/en/8933.html to reset the sync data on MobileMe. This will then populate down to all your other devices (assuming the information on your computer is the most up to date.)
Hope that helps.

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