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What you perceive as a problem is actually a feature - a consequence of shifting synchronization of all servers, applications and devices to the SyncService framework. Now, iTunes is configured to interact with the truth database maintained by SyncServices to synchronize iPods, .Mac Sync handles a similar interaction to synchronize with .Mac, and iSync is relegated to handling mobile handsets and Palm handheld organizers and smartphones.
In the same manner, applications like iCal and the Address Book interact with the SyncServices framework, as do many third-party applications like MySync, the Missing Sync for Palm OS, DayLite, and others.
If your mobile handset is not connected via Bluetooth or USB, or iSync is not running when you initiate a synchronization event using the HotSync icon, or the button on your cable or cradle, then your device will not be synchronized until it is 'attached' and iSync is launched. This update occurs because the SyncServices engine is aware that the device exists and was not available during the prior event. As soon as becomes available, the update takes place.
If you want your mobile handset to be simultaneously synchronized when you synchronize your Palm device, then you must do two things:
• 'attach' it via Bluetooth or USB, and
• launch iSync prior to initiating the HotSync