Mustang Purchase Help

Taking mail to the next level

All tools. One place.

E-Mail featureChat featureMeet video-conference featureCalendar featureFile share featureContacts feature E-MailChatMeetCalendarFile ShareContacts
  • Mac OS X
  • Windows
  • Linux
  • Windows
  • macOS
  • Linux
  • Android
  • iOS
  • Web

Highlights

Lock

Local

  • Running entirely on your device
  • Protects your business data
  • Also available with optional full stack server package
Owl

Easy

  • 100% Exchange for Microsoft compatible
  • Full Outlook replacement
GitHub

Powerful

  • Open Source at heart
  • Free version is highly powerful
JMAP

Collaboration

  • Team collaboration and seamless integration. JMAP, PGP encryption, S/MIME. etc...

Privacy &
Security

Privacy is a fundamental human right. This is why Mustang runs entirely on your device, keeping your data under your control. Share only with the people you want to share with.

Lock

You are
in control

Mustang is powerful. Find new ways to get work done faster. Stay on top of the flow.

Superman

Open Protocols
and Open Source

Communication should be free of the control of a single company. We are not locking you in. With open protocols, you can integrate Mustang with your existing infrastructure.

Sunshine

Easy to use
for everybody

Designed for both novice and power users. Simple interface.
Highly intuitive and user friendly.

GamerHikerElder

What our customers say

"I absolutely love Mustang — the sleek design and intuitive functionality make it a standout client."

Zain

Zain

"Mustang works reliably and can display/synchronize shared calendar, shared mailboxes, and address books."

Steve

Steve

@steve

From the people who brought you Owl, These are the companies who trust us

  • NASA
  • Cisco
  • Department of Energy USA
  • Department Treasury
  • Standford

Technology

Research

University

Finance and Press

Try out Mustang

Download

For professional use

See plans

Adapt to your company's needs

Get in touch