IPhone Calendar keep resyncing, and the color keeps changing too.

Question

I have my iPhone syncing with our corporate exchange server. Everything was working well. I updated my phone to iOS 4 and a few weeks later I started to see issues.
The calendar items are blue. They they all disappear. I see it re-syncing. Not everything shows up... The ones that do show up, are now red.
The next time the red goes away, a re-sync happens, and now the calendar is purple.
And so on through the rainbow...
I seems that I keeps re-syncing and doesn't get everything when it does.
Any help would be appreciated, thanks.

Answer 1

I've had the same problem with a new iPhone 4 (the problem didn't manifest with my old phone upgraded to IOS4). Mail and Contacts are fine, but Calendar kept losing synchronization with the Exchange server.
Set up the Exchange account and everything seemed fine. A day later most, but not all, of my exchange appointments were nowhere to be found. Deleted and recreated the Exchange account, calendar back ... but a day later poof all sorts of missing entries. Same symptoms in list view the original poster sees.
This morning I changed the calendar Sync options from 1 month to 'All Events' and suddenly everything is good again with Calendar. (Initially, I saw the events in list view, but not in day or month view. Restarted the Calendar app and things are now fine in all 3 views)
I have a lot of recurring appointments with exceptions. Several standing conference calls have original creation dates well over 6 months ago. The program manager sends status reports as an update to the calendar item, so almost every past appointment is in the system as an exception to the recurring event. The funny thing, though, was that I was seeing some of the recurring appointments, but not any of the individual items.
Don't know for certain, but if I was a betting man I would bet the problem lies with the way IOS4 handles recurrence and exceptions.
I also don't know if this "fix" will hold up. The last couple of times I got Calendar in sync, it went out of whack within 24 hours. I'll update in a day or so if things hold up.