Exchange users have the luxury of being able to synchronize their information across multiple computers and devices wirelessly and I’d advise they stick with that.No matter what I advise they never sync Exchange data directly from computer to i Phone or else they risk duplicate data appearing as a result of the two methods of syncing. Sometimes Mobile Me will have problems syncing your data across multiple devices.Ideally, the service will keep ten items (Bookmarks, Calendars, Contacts, Dashboard Widgets, Dock Items, Keychains, Mail Accounts, Mail Rules, Signatures/Smart Mailboxes, Notes/Preferences) synced between your computers, i Phone and other devices. You can also back up your Contacts in the Address Book on your computer by choosing File - Back up i Cal. Check Apple's Mobile Me support page to make sure the service is up and running. Log into your account at and make sure your Calendar and Contacts data is correct.

Reason for discrepancies, was my default Calender on i Pod, was set to a different Calendar than Outlook.Verify "Calendar" is selected in Outlook 2007 under "My Calendars".On i Pod Touch:- Go to - "Settings" Select - "Mail, Contacts, Calendars" Move down to - "Calendar" section Select - "Default Calendar" Select - "Calendar" under "From My PC" heading (Blue dot) Now go back to your i Pod calendar and select "List" view.The best troubleshooting I have found for this problem is i Phone, i Pad, i Pod touch: Troubleshooting contact and calendar syncing via USB on Windows(Apple), mainly due to the fact that it explains how to reset sync history in i Tunes, a process that reevaluates the contents of both devices and tries to resync them.Another good little trick is to try a "Replace data on this i Phone" near the bottom of the info tab, that will wipe the specific data set off the i Phone and replace it with the computers, often a good way to get them talking to each other again.