I think your best bet would be to sync your iPhone with Outlook on your laptop and then sync your Outlook with your exchange service. Make backups of your pst files before you sync to server.
Most exchange systems I've used make you add the account to Outlook and then you can upload your Outlook data to server.
Some make you create a new blank pst file and sync that. Then you have to import your backup pst file into your new exchange account.
Once that is all done either way, then turn on calendar and contacts on iPhone and you'll be set.
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