We are considering either upgrading to Lotus Notes 6.5.2 from version 4.6 or changing to Exchange Server 2003/Outlook 2003. I prefer Lotus Notes because of better security, instant messaging, and database/groupware functions. I have to explain to the executives which option is best. One reason for using Lotus Notes is the large conversion cost of changing the Lotus Notes E-mail boxes to Outlook.
Which would you choose and why?