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Apple is forcing all MobileMe users to upgrade to the new MobileMe Calendar format on May 5th. From Apple’s official support page on the issue…

On May 5, 2011, MobileMe will transition to the new Calendar service… You must upgrade to the new Calendar by May 5, 2011 to maintain calendar syncing between your devices and to continue accessing your calendar at me.com. See How do I upgrade to the new MobileMe Calendar … for instructions.

While this is good news in that the new calendar structure (using the CalDAV standard) is more robust than the iCal/MobileMe calendar, it will cause issues for people who have enables the Daylite to iCl sync option in Daylite. IF YOU DO NOT SYNC CALENDARS BETWEEN DAYLITE AND ICAL — THIS DOES NOT APPLY TO YOU.

Do not enable the "Synchronization" preference in Daylite

So why is this happening, and why is it a problem? The new MobileMe calendars are truly cloud based: your iCal app on the Mac will talk to the MobileMe calendar server and sync its data from there. So will your iPhone/iPad. However, Daylite was designed to work with LOCAL iCal calendars, ones that stored their data on the Mac, and then through MobileMe, would synchronize those changed to other Macs using a MobileMe account. While the difference may seen unimportant, the current version of Daylite (designed before Apple announced these changes) expects to see the old, LOCAL, iCal data for each calendar on your Mac when it performs its sync to iCal. It has no way of communicating with the new cloud based MobileMe calendars. If you were to enable synchronization in Daylite for Appointments and Tasks, Daylite would create a new LOCAL iCal calendar, one that exists only on your Mac. This local only calendar would not be part of the MobileMe system, and wouldn’t sync across your Macs or iPhone/iPads. You would see calendar information duplicated in iCal, and it would be a data dead end.

The instructions provided by Marketcircle (http://www.marketcircle.com/mobileme/) recommend tuning off Daylite to iCal sync entirely, and I concur. Address Book and iCal are free for a reason. They are consumer products. They can’t handle the volume that a shared business database like Daylite can create. If you value your data, I recommend turning the Daylite to Sync Services feature OFF permanently. Instead, embrace the robust, multi-user calendar features of Daylite on your Mac and Daylite Touch on your iPhone and iPad.