Thunderbird
thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. the project strategy is modeled after mozilla firefox.
Scribe is a small and fast email client with an intergrated contact database and calendar. It supports all the major internet mail protocols and uses international...
scribe is a small and fast email client with an intergrated contact database and calendar. it supports all the major internet mail protocols and uses international standards where possible. scribe doesn't required installing or uninstalled and can be used from a removable drive without reconfiguration. it comes with a bayesian spam filter and translations to many different languages. updates are published regularly to respond to problems and to add features. because scribe runs on windows and linux (mac, intel only, in beta) you can take your mail with you when you change operating system. and don't worry about viruses, scribe protects you from the usual security holes in other email clients with it's own virus safe html control and executable attachment protection.
Extensible by Plugins/Extensions Portable Lightweight
Productivity Social Online Services
extensible portable email-client lightweight calendar spam-filter cross-platform
thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. the project strategy is modeled after mozilla firefox.
Free Open Source Windows Linux BSD Mac Haiku
Part of the Microsoft Office Suite, Outlook is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
Commercial Mac OS X Windows Android iPhone Android Tablet iPad Web Windows Phone
There’s big news attached. The best way to manage email on a Mac gets even better with OS X Yosemite.
Free Mac OS X iPhone iPad
EssentialPIM lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Freemium Windows Android iPhone
The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts, files and documents in the cloud, yet having them locally accessible when on the road.
Free Personal Mac OS X Windows Linux
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE.
Free Open Source Mac OS X Windows Linux BSD
windows 10 has mail and calendar apps already built in.
Free Windows Windows RT