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 Good support for Google's services
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 Excellent GPG support
The integration with GPG is excellent. You can sign, encrypt, decrypt, authenticate and verify GPG signatures and GPG signed/encrypted email messages. All of that is just a setting away.
Pro HTML rendering is great
Of the many email clients available on GNU/Linux, Evolution has the best HTML renderer. It renders HTML and the entire email content exactly like it would appear on a full blown web browser. Not many email clients are capable of doing that.
Con Can't choose different settings for each mail account
Settings have to applied to all mail accounts.
Con RAM heavy
Very heavy on RAM usage.