Appointments disappearing from iPhone

I just missed an important appointment today because the appointment disappeared from my iPhone, which is what I use to check my schedule. After learning that I missed the appointment, I checked iCal and mobileme through Safari, and the appointment still appeared in both of those calendars. I hit the sync now button on my MacBook Pro several times trying to sync my various calendars, but the appointment still does not appear on my iPhone (although it is still in all the other calendars).
Mobileme is truly worthless if it will not sync properly, and worse yet if it deletes appointments without warning from the device onto which they were initially entered. Is this service ever going to work properly. Has anyone else experienced this particular problem?

I've been having this problem. I have done the "reset sync history" thing and also replaced my data a bunch of times. The problem is I keep having to reenter information! The fact that I will add an event on my iPhone and then I'll make a call or do something else and when I return to the calendar it appears that either that event is deleted when the the phone and MM "pushed" the data.
For example, an hour ago I added 2 new events on my iPhone calendar and moved the date of 2. I even let the calendar program stay open for a few minutes to make sure that is "pushed" the data without any interruptions. I then returned to my calendar 15 minutes later to check to see if everything stuck and it was all still there. I then checked it an hour later and all of the data returned to how it was RIGHT BEFORE I CHANGED EVERYTHING! I can't afford in my business to miss the meetings that I have entered or to lose the information that I enter!
I honestly think that there is no solution for this right now, because MM is so unstable. There is no option out there that let's me designate which device should overwrite the others. There should be an option to set iPhone>MM>iCal or however I want to set it. Otherwise MM will just decide to overwrite my iPhone data whenever it wants.... who can afford that in the business world?
Also, It is resetting my "default calendar" every time this syncing problem happens... this makes me think that my calendar on the iPhone is crashing and not pushing the data immediately. Then when it resets on the iPhone it reloads some old data from the MM servers that SHOULD have been replaced hours ago but wasn't.

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Appointments disappearing from iPhone

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