Outlook 2003 automatically displays error messages from the system tray when connectivity issues are detected. Unfortunately, when using mail servers off-site, these balloon tip error messages tend to appear excessively, even when there are actually no problems.
You can stop these messages with a couple quick registry fixes:
- Go to Start > Run and type regedit.
- Navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Display Types\Balloons
- Create 3 DWORD values named “Exchange”, “NetConn”, and “NetWarn”, all with the value of 0.
- Close outlook and open it up again.
If done correctly, balloon tip error messages will no longer pop up.

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