Would you kindly let me know how I can sync data (contacts, calendar, etc.) from my Palm Handheld (Z 22) or from my PC to my iPhone 5?
To transfer the contacts and any other data, Palm Desktop software needs to be used. You will have to export each contact as vCard and then import it in Outlook Express. Once the contacts are imported into Outlook, install Itunes if you don't have it and connect the iPhone. Sync the items and the iPhone will automatically start to transfer the contacts to its database.
You could use Sycnios data transfer to transfer all your data from PC to your iPhone 5.