Evolution is a personal information management application that has calendar, email and contact support.
Ranked in these QuestionsQuestion Ranking
Pro Manages contacts, tasks, calendar and memos as well
Pro Great integration with Gnome environment
Pro Supports exchange servers
Evolution is one of the few Linux desktop e-mail clients that's supports exchange servers.
Pro Clean interface with 2 layout variants
Going to View > Preview has the option of switching between "Classical View" and "Vertical View".
Pro Good support for Google's services
Con Can't choose different settings for each mail account
Settings have to applied to all mail accounts.