
The various add ons and themes available make Thunderbird one of the most customisable email clients available and it should be able to meet your needs without any issues.Mailbird is an intuitive email client that promises to deliver an uncluttered experience and several handy features for managing your email messages. It is an advanced email app so there are plenty of features some of which even Outlook does not support.

Mozilla Thunderbird is one of the more stable alternative to Outlook provides plenty of extensions and has a good security system which makes it ideal for business users or those concerned with privacy of their data.

It’s completely free to use and comes bundled with Windows 10 so that may be a good reason to upgrade if you haven’t. It’s a Metro app so it is well optimised for tablets and touch screens and has support for iCloud, Office365, Exchange, POP/IMAP and more. The Windows Mail app received a new look as part of the Windows 10 release and while it’s not the most fully-featured email client out there, its still a nice alternative to Outlook if you have simple needs.

Not totally free for all features (Pro version costs $45).
