Mailbird 2.0 vs Mailspring

This allows you to funnel all emails from all accounts into one unified folder, so you don't have to move between different accounts.

The UI looks simple but is customizable. UX is also simple and easy to use.

Users who only need to use the basic features of the app have a free version available, though it does limit to only 1 account. There is a paid Mailbird Pro version that does extend functionality and allows for unlimited accounts but it does cost $1.00 a month or $45.00 as a one time fee.

Mailbird 2.0 supports separate apps that can extend the programs functionality such as Sunrise Calendar, which allows one to add multiple calendars in one view or Evernote which allows for easy not taking and sharing.

This allows you to have one layout with your navigation bar, message list, email convos and productivity apps in view at once so you can work your email and productivity tools synchronously.

This allows you to easily manage all your email contacts with all critical details in one place. Create groups too. All your contacts in one place and synced with your different email contact providers.

There is no limit to the number of email accounts you can manage from Mailbird.

Allows you to preview attachments selected in an email and hit the 'spacebar' to view them rather than having to download it and open a file.

This allows you to easily import all your emails from your previous email client to Mailbird.

Helps you scan through lengthy emails to get the important parts.

Mailbird 2.0 has touchscreen support for tablets and other touch screen Windows devices which makes it easy to control no matter what kind of Windows device is being used.

Mailspring has great integration with gmail features and tags.

The UI is very well designed and neat.

Activity tracking is built into Mailspring so you get notified as soon as contacts read your messages and can follow up appropriately.

Mailspring uses a C++ sync engine designed to be as efficient as possible, so you can leave the app running and not see your laptop battery life drain away.

Using a single inbox for all of your email accounts helps you get more done in less time. Mailspring supports every major mail provider—Gmail, iCloud, Office 365, Outlook.com, Yahoo!, and IMAP/SMTP—so you have a single, streamlined command center for all your messages.

You can swipe to archive / snooze messages and specify when you'd like them to resurface in your inbox.

Only in the paid version though.