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From what I know, going from A03 to A04, backups (using Data Backup program on PDA) will not restore so backup PIMs (Calendar, Contacts, Notes) with Activesync. Make sure you copy databases for other programs such as Handwallet, MS Money, Word Mobile, Excel Mobile, etc. Once you go to A04, you can't go back to A01 as far as I know, but I haven't heard of having more problems with A04, more than you have with A01.
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