I think it’s useful to translate my blogpost about my solution for successful syncing of mobileme with the local adressbook on the Mac.
When syncing with MobileMe I had the following problem:
Syncing between the Mac and MobileMe simply didn’t work for contacts, between the iPhone and MobileMe it synced perfectly. The calendar also syncs flawlessly.
I tried all the instructions from the various support forums, but nothing helped – as with many fellow sufferers.
Solution (Prerequisite: Contacts at me.com are up-to-date!)
Backup the Address Book on your Mac.
Close the Address Book application on your Mac.
Set to manual-syncing in MobileMe settings (System preferences).
Rename the folder ~/Library/Application Support/AdressBook.
Sync with mobileme.
My AdressBook folder was automatically created and now it synchronizes my contacts with MobileMe!
Set syncing back to automatic.
Please ensure all your contacts are correct, then you can delete the renamed folder.