Simson Desk is a desktop email, calendar and task client. It works with Microsoft 365, signing in with your Microsoft account, and with any mailbox that speaks IMAP and SMTP — Google Workspace, Zoho, Titan and most business hosts. It keeps a local copy of your mail so it stays fast and readable offline.

• Mail with conversation threading, rules, folders and multi-select
• Calendar and Microsoft To Do tasks
• Address book built from your contacts, your organisation's directory and the people you actually write to
• Remote images blocked until you allow them; links open in your browser
• Save attachments, and save a message as .eml, .html or .pdf
• Colour themes that can change by day or between working and off days
• The local copy encrypted at rest, with the key held in your system keyring
• Locks itself when left idle, and needs a fresh sign-in to reopen

One step after installing, until the store grants it automatically:

 sudo snap connect simson-desk:password-manager-service

That is what lets Simson Desk keep your sign-in in the system keyring. Without it there is nowhere to put your tokens and the app asks you to sign in on every launch. Everything else connects on install.

Privacy policy: https://simsondesk.com/privacy/email-client

Simson Desk is an independent client and is not affiliated with or endorsed by Microsoft.