Opera Mail
Opera Mail powerfully organizes, indexes, and sorts your messages. It has spam filtering (both automated and Bayesian), supports POP3 and IMAP, newsgroups as well as Atom and RSS feeds.
Part of the Microsoft Office Suite, Outlook is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
microsoft outlook, part of the microsoft office suite (not to be confused with microsoft outlook express), is a personal information manager that lets you manage your email, calendar, contacts, and tasks.
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Productivity Social Online Services
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