Is there an Outlook app for Linux?
No. Microsoft makes Outlook for Windows, macOS, iOS and Android, but not for Linux. On Linux the official options are Outlook on the web in a browser tab, or a progressive web app wrapper around that same website.
That works for reading the odd email, but it falls short for people who spend the day in their inbox: no real desktop notifications in many setups, no offline access, browser shortcuts fighting with Outlook’s, and one more tab to lose.
Why most Linux email clients struggle with Microsoft 365
Microsoft 365 turned off basic authentication for Exchange Online, and new tenants also have SMTP authentication disabled by default. Email clients that still expect a username and password — or that need you to set up a separate bridge — either fail to sign in or can receive mail but not send it.
BoltSweep signs in with Microsoft’s modern authentication (OAuth 2.0 with PKCE), reads over IMAP with that token, and sends through the Microsoft Graph API. The result: your work account behaves on Linux the way it does in Outlook.
BoltSweep vs. Thunderbird and Evolution on Linux
Thunderbird is a capable, free open-source client and a good choice for many. Evolution integrates with GNOME and supports Exchange through EWS. BoltSweep focuses on a different thing: keeping the Outlook way of working — layout, shortcuts, server drafts, imported signatures — with a modern, fast interface and support for bringing your own AI assistant.
Built for Linux, not ported to it
BoltSweep is developed and tested on Linux every day, alongside Windows and macOS. It follows your system’s light or dark theme, uses your desktop’s keyring, and works without a desktop environment’s mail stack.