The current <default> profile will be automatically selected when CDP starts but the profile to be used can be changed to any of the existing profiles.
The profile can be changed only if Outlook is not running at the same time as CDP. If Outlook is running, the option to change profiles will be disabled.

If Outlook is not installed, the Exchange server login information will be requested - see Select Exch Server
The Exch user information cannot be ambiguous and must result in a direct connection to the Exchange server.