iPhone Can’t Sync Information
While a lot of iPhones sold to corporate customers are connected to the company's Exchange server, even more float around officially unsupported. At least until something goes wrong. When your VP of Marketing signs a two-year contract on a new toy, your IT department has just gotten into the iPhone business. Which is why it's so frustrating when you see a message like this sitting in your trouble ticket queue:
iTunes cannot sync information with the iPhone "3G" because
syncing has been disabled on this computer.
The dialog even offers you the opportunity to enable syncing again, but the option doesn't actually result in anything. Once this error appears, you can't synchronize any of the data in the iTunes "Info" tab (including contacts, calendars, bookmarks, and mail accounts), though music, picture, and video syncs work normally. Home users might not notice for months, but if an iPhone is meant for business this issue renders it basically useless.
The problem is corrupt SyncServices data, the system that keeps track of information between Macintosh systems and applications. The solution is to delete the the files in ~/Library/SyncServices and ~/Library/Application Support/SyncServices, log the user out and back in, then reset the sync preferences in iTunes. This forces OS X to rebuild the SyncServices database, resolving the issue.
