ICal events being deleted when syncing with Palm Zire 21

I have been syncing my Palm Zire 21 with iCal successfully for over a year with few problems. A few weeks ago I noticed that almost, but not all of the events on both the Palm device and iCal more than three months old were gone. Then, a few weeks later, I noticed that the events suddenly were all back in the iCal application, but not on the Palm device.
But this week, I used HotSync (as usual) to sync iCal and the Palm device, and the events were gone again. Now I am wondering what on Earth I am doing to cause this. I have read the articles about setting up to sync. I double-checked to be sure I have been syncing the way that is outlined in the instructions in the help articles.
I must have missed something vital. I have been backing up my iCal to my .Mac account using Backup. I am thinking that I can restore the iCal events using my last backup. Can I? And how do I keep this from happening again?
MacBook Pro Mac OS X (10.4.10) "OS10.4.10" "iSync 2.4" "iCal 2.0.5" "Hotsync 3.1"

Found the issue for me. The events are not deleted, but filtered in the standard calendar view. The iPhone shows everything as it should. Outlook 2003 has all the events to as seen when going to categories view.
It seems that once events pass on the iPhone and then a sync via iTunes to Outlook 2003 the "All Day Event" field is removed from the calendar entry.
Creating another Day/Week/Month View in outlook 2003 that has a filter to only include calendar entries where the "All Day Event" field "does not exist" will allow viewing the "hidden" past events.
Hopefully this will be fixed VERY SOON.

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I'm having the exact same problem as described above, and I'm a little desperate to get my iCal entries back as well...
Concerning the question of whether I have a backup: I'm actually not sure, maybe you can tell me whether I do? The situation is the following:
I entered a (significant!) number of iCal entries on my iphone directly. The iphone, in turn, is being connected to my MB Pro at home, as well as my PC at work. Podcasts and such are updated from my PC, so I'm guessing that the PC is the primary iTunes linked to the phone. When I connected my iphone to the iTunes on my MB Pro, however, it asked whether I would like to synch as well. As I had a number of iCal entries on my MB Pro that I wanted to also see on my iphone, I agreed. It warned me (like many times before) that this would chance more than 5% of the iCal entries, but it never before had deleted any of them! When I checked again, all my direct iphone iCal-entries had disappeared.
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ICal events being deleted when syncing with Palm Zire 21

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