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- Open Outlook 2007.
- Click "Tools" > "Account Settings" from the main menu.
- Click "Change"

- Click "More Settings..."

- Click the "Connection" tab, then click "Exchange Proxy Settings"

- Tick “On fast networks, connect using HTTP first, then connect using TCP/IP”

- Accept changes - Click "OK", "OK", "Next", "Finished", "Close"
- Exit and restart Outlook
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