Alternatives to Spark for Windows with any license

Thunderbird

Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.
- Thunderbird is buggy, frequently locks up, slow and takes long to update from server. Spark is fast, easy and beautiful Guest • Mar 2017 • 13 agrees and 3 disagrees
- There is NO Spark Version for Windows. That's why Thunderbird is the Best Alternative IMO. Guest • Apr 2018 • 4 agrees and 1 disagrees
Free Open Source Mac Windows Linux BSD PortableApps.com ... Haiku
Extensible by Plugins/Extensions Built-in RSS reader Built-in Calendar Calendar integration ... Categories Customizable Extensible by Plugins/Extensions Free API Gmail integration Google Calendar integration Import from Google Reader Support for IMAP Integrated Chat Integrated Password Manager Integrated Web Browser Legacy addons support Multiple Account support Export to OPML Import feeds from OPML POP3 Support Portable Secure File Sharing SMTP integration Tabbed interface Support for Themes Add a feature

1783 Like
Microsoft Office Outlook

Part of the Microsoft Office Suite, Outlook is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
- Integrates deeply into windows OS and has all the bells and whistles. Guest • Jun 2017 • 1 agrees and 2 disagrees
- Best client for windows that is out there. others are buggy or do not sync correctly. Guest • May 2017 • 0 agrees and 4 disagrees
Freemium $ $ $ Mac Windows Web Android iPhone ... Android Tablet Windows Phone iPad Apple Watch Android Wear
Box.com integration Built-in Calendar Calendar integration Dark theme ... Dropbox integration Email scheduling Exchange Integration Flight Status Gmail integration ICloud Integration Integrated Search Multiple Account support Office 365 integration Onedrive integration Organize mails Shared calendars Signature with image Unified inbox Yahoo Integration Add a feature

315 Like
eM Client

eM Client is a full featured e-mail client with a modern and easy to use interface. eM Client also offers calendar, tasks, contacts and chat.
- Is not a free version of an email client. The fact that you have to pay for more than one email account makes it useless. Guest • Aug 2018
Freemium Windows
Calendar integration Automatic Backup Built-in themes Built-in translation ... CalDAV CardDAV Cloud sync Combined Inbox Sync Contacts Dark theme Email preview Encrypted email Sync with Google Calendar Support for IMAP Imports email from Live mail POP3 Support Sync Calendars Threaded Conversations Add a feature

179 Like
Mailbird

Mailbird is more than just another email client - It's an all-in-one communication platform for email, contacts, calendar, apps, task management, video meetings and...

Freemium $ $ $ Windows
Undo send Asana integration Sync Contacts Dropbox integration ... Facebook integration GSuite Integration Multiple Account support Organize mails Slack integration Threaded Conversations Trello integration Twitter integration Unified inbox Add a feature

271 Like
Postbox

Postbox is an email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power...

Commercial Mac Windows
Multiple Account support Box.com integration Built-in RSS reader Dropbox integration ... Extensible by Plugins/Extensions Support for IMAP Multiple languages Onedrive integration POP3 Support Tabbed interface Visual Programming Add a feature

131 Like
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...

Free Mac Windows PortableApps.com
Built-in RSS reader Integrated Spam Protection Mail filtering Message Filtering ... Portable Add a feature

97 Like
- Discontinued Opera Mail is no longer updated and supported, but last version, 1.0.1044, released in February 2016, can be still downloaded from the official website.
Claws Mail

Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration...

Free Open Source Windows Linux BSD
Lightweight Built-in RSS reader Content Filtering Customizable ... Extensible by Plugins/Extensions Support for IMAP Multiple languages Multiple Account support Add a feature

76 Like
Mailspring

Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro...
- It's the most similar, with the features most inline. It even looks the same in appearance, and all the menus and shortcut keys match. Guest • Mar 2018 • 0 agrees and 1 disagrees
Freemium $ $ $ Open Source Mac Windows Linux Arch Linux Fedora ... Ubuntu
Dark theme Multiple Account support Email tracking Sync Contacts ... Customizable Drag n drop Email Analytics Email tracking & analytics Extensible by Plugins/Extensions Support for IMAP Support for Themes Threaded Conversations Unified inbox Add a feature

29 Like
Microsoft Mail and Calendar

Windows 10 has Mail and Calendar apps already built in. With the Mail application you can now easily see all message from your...

Free Windows Windows S
Email tracking Bundled with Windows Add a feature

21 Like
The Bat

The Bat! is a secure email client software, built to protect your correspondence against third-parties. .

Commercial Windows S/MIME OpenPGP
Built-in RSS reader Support for IMAP POP3 Support Portable Add a feature

46 Like
Nylas Mail Lives

Nylas Mail Lives is a fork of Nylas Mail that fixes many longstanding issues, improves the client experience, and is committed to...

Free Open Source Mac Windows Linux Self-Hosted
Extensible by Plugins/Extensions Multiple Account support Add a feature

3 Like
- Discontinued On its github page it states it is archived and is no longer maintained.
Hiri

Fast, good looking email client. Lighter than MS Outlook with some unique and clever features. Works ONLY with Outlook / Exchange.

Commercial $ $ $ Mac Windows Linux
Calendar integration Convert Email to Task Office 365 integration Add a feature

22 Like
Koma-Mail

Koma-Mail is an email client which is comfortable and has very handy functions. It does not need an installation, so that you can run Koma-Mail from your flash drive...

Free Windows
Built-in RSS reader Multiple languages Multiple Account support POP3 Support ... Portable Support for Unicode Add a feature

4 Like
- Discontinued Development of KOMA Code apps stopped in January 2017. Last version of Koma-Mail, 3.83, released in March 2012, can be still downloaded from the official website.
EmailTray

EmailTray is a smart email client and an email notifier for POP3 and IMAP email accounts, including Gmail, Hotmail, Yahoo mail and AOL. EmailTray intelligently ranks...

Free Windows Android
Support for IMAP POP3 Support Add a feature

3 Like
IncrediMail

Ad-supported email client for the Microsoft Windows operating system by IncrediMail Ltd. that offers the ability to add e-mail backgrounds, Emoticons, Ecards, Sounds...

Free Personal Windows
Animations Add a feature

9 Like
- Warning Installs a browser hijacker that changes the homepage and default search engine and won't let you change back without uninstalling it: https://support.mozilla.org/en-US/questions/933191