Complex sentence: While the basic interface did not support search with Exchange Server 2003, the UI has been reworked for Exchange Server 2007 and OWA Light now supports search for mail items, and managing contacts and the calendar has also been improved.
Split into simpler sentences: While the basic interface did not support search with Exchange Server 2003, the UI has been reworked for Exchange Server 2007. On Exchange Server 2007, OWA Light now supports search for mail items, and managing contacts and the calendar has also been improved.