Running Outlook 2003 vs. Outlook 2007 against Exchange 2007

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What functionality would you lose if you ran Outlook 2003 against an Exchange 2007 server instead of running Outlook 2007?
https://www.microsoft.com/exchange/evaluation/featurecomparison.mspx

It looks like you would not have the following (listed in my order of preference):

  • Super fast search capabilities (my favorite)
  • Scheduled OOF
  • External OOF
  • Scheduling assistant
  • Other features that corporations love like: AutoDiscover, Partial Item download, Managed folders...

Some of the features above are available via OWA 2007 however.