Well, if you were on site installing exchange on leap year day then you have my sympathy. In a series of news items, the reasons for techies everywhere having problems have been reviled, and not just for problems with Exchange.

First, the 25-year-old leap year bug infesting Microsoft Excel…
Next hit, Exchange, SQL Server 2008, Windows Small Business Server, and Windows Mobile.

http://www.theregister.co.uk/2008/03/04/microsoft_admits_to_exchange_leap_year_bug/

http://www.theregister.co.uk/2008/03/04/sql_server_hit_by_leap_year_bug/