MobileMe and iOS 4- Syncing Has Stopped Working

Question

Since "upgrading" to iOS 4, MobileMe Calendar Syncing has stopped working. This is the worst upgrade. Slow iPhone, spotty usability, and now MobileMe syncing isn't working.
Anyone else having the same problem? Any fixes. I've tried the usual. Push: On, MobileMe Sync: On, etc....

Answer 1

Like you, I ran into MobileMe synchronisation problems after I upgraded my iPhone’s software to iOS 4. I have an iMac running under Mac OS X version 10.6.4 and a 3G iPhone. I was able to solve the problem with the following “brute-force” (but very simple) sequence, which I also used after prior iPhone software updates and it has always worked for me. Note that it involves the removal of all contacts and calendars from the iPhone so if you are worried that you may not succeed in copying the data back, you may want to look for another solution.
(1) Make sure that MobileMe is synchronized with iCal and Address Book:
Open MobileMe Sync Preferences
Click on the “Sync Now” button
(2) Back-up the data in the iCal and Address Book applications (just in case):
File / Export / iCal Archive
File / Export / Address Book Archive
(3) To avoid erasing the data on the computer if something goes wrong:
Open MobileMe Sync Preferences
Select the “Sync” tab
Un-check “Synchronize with MobileMe”
(4) On the iPhone:
Settings / Mail, Contacts, Calendars
In the “Accounts” section, select the MobileMe account
Turn “Contacts” off
Select “Delete from My iPhone”
Turn “Calendars” off
Select “Delete from My iPhone”
(5) Check that all contacts and calendars have been deleted from the iPhone, then do:
Settings / Mail, Contacts, Calendars
In the “Accounts” section, select the MobileMe account
Turn “Contacts” on
Turn “Calendars” on
(6) Wait (it may take a while) until all contacts and calendars have been updated on the iPhone, then do:
Open MobileMe Sync Preferences
Select the “Sync” tab
Check “Synchronize with MobileMe”
After having done all this, changes made to contacts or calendars on the iMac or iPhone were properly synchronized with MobileMe. You may have tried something similar without success, but if you have not, hopefully the above will work for you too.