Calendar question - double entries

Are there duplicate calendars in Mobile Me when you're viewing the calendar section or just on iPhone? What calendars show?? eg. home outlook entourage etc...
Have you tried resetting the sync data?
Are the two calendars showing different events or the same events?

You possibly did tell it to merge the two calendars when loading...

If Mobile Me and Outlook only have one entry then you may try Going to Mobile Me preferences on the synced machine...then first choose reset sync data, then choose between the two options it gives...Replace data on iPhone with data from the cloud...or replace data on the cloud with what's on iPhone...Obviously I;d choose the first to replace the iPhone with what's on the cloud...

If that doesn't work...then...

Try removing the Mobile Me account from iPhone and make sure both calendars are gone from iPhone and then add the Mobile Me account back and reset the sync data in Mobile Me preferences...

On iPhone: Settings --> Mail, Contacts, Calendars --> Select your MobileMe account --> Turn Calendars off. When it asks you to keep the data or delete it from your iPhone, choose Delete. Wait a couple of minutes and then turn Calendars back on. Choose to Merge Data. You should be good to go.

I had the same problem- just got a 3GS and transferred all from my original iPhone- double entries in Calendar and Contacts. This solution did the trick for both.

Thanks Atilano!

Thanks Atilano!!! This has been a problem for me for awhile. I got feed up today. I'm sorry it took me so long to look up the answer. You made my day!!

I had this problem too!
Solved!
I wanted to say thank you!!!!
Have a great new year!