Your @cowork24.net address, read in the browser or in the mail app you already like.
- A real mail client in your browser, built for this workspace
- Works with Thunderbird, Outlook, iPhone and Android
- Every message signed, so it lands in inboxes
Welcome to cowork24
Your whole workspace,
around the clock.
Mail, chat, meetings, files and your calendar — together in Atrium, one private workspace that your company runs itself. Sign in once and pick up where you left off, from your desk, your laptop or your phone.
One sign-in for everything Two-factor ready Encrypted in transit
The workspace itself
Atrium
An atrium is the space every room in a building opens onto. This one opens onto your mail, your conversations, your meetings, your files and your calendar — in one window, behind one sign-in, with nothing to install on your computer. On an Android phone there is an app as well.
Mail
A real mail client, not a bolted-on inbox.
Chat
Conversations that stay on your servers.
Meet
Start a call, or join one by link.
Files
Browse and attach without leaving the page.
Calendar
Your days, invitations and replies.
Contacts
The people you write to, in one book.
Tasks
What you owe, and what you are owed.
Inside Atrium
Four rooms you will use every day.
No juggling accounts and no scattered links. Everything below lives behind the single sign-in you already have.
Files
Keep your work in one place, reach it from anywhere, and share it without email attachments.
- Share a link instead of a 20 MB attachment
- Earlier versions are kept, so an overwrite is not a disaster
- Deleted by mistake? It waits in the trash
Talk
Chat, call and share your screen with colleagues — without the conversation leaving your company's servers.
- One-to-one and group video calls
- Rooms that stay put between meetings
- Guests can join by link when you invite them
Documents
Open a document, spreadsheet or slide deck straight from your files and edit it in the browser — together, at the same time.
- Word, Excel and PowerPoint files open as they are
- Two people, one document, no emailed copies
- Nothing to install — it runs in your browser
On your phone
There is an app for your Android phone.
It is the same Atrium — the same mail, chat, calls, files, calendar, contacts and tasks — wrapped in an app of its own. It exists for the few things a page in a browser cannot do on a phone. There is no iPhone version; on an iPhone the browser is still the way in.
A call survives your pocket
Put the phone away mid-call and the call carries on. A browser stops the camera and the microphone for a page nobody is looking at.
Calls ring the phone
Someone calling you arrives full-screen over the lock screen, the way a telephone call does.
You hear about new mail
A notification tells you who has written, without you going to look.
Files go both ways
Save an attachment onto the phone, and attach something from it without leaving the app.
A passkey still works
Signing in happens in your browser rather than inside the app, which is what lets a passkey sign you in.
Cowork24 for Android
Published on the Apps page of your account portal. There is no app store in the way — it is a signed app you install yourself.
- Android 8.0 or newer
- It updates itself — it looks for a new version when you open it, and offers it to you
- Your usual work account signs you in, in the browser you already trust
The same page also lists Atrium for Android, which is the same app for other companies — it asks for your work address and finds their server from it. Here, install Cowork24 for Android.
Your other devices
Reach your workspace from whatever is in front of you.
In a browser there is nothing to set up at all. Two cases need a word of explanation: the mail app on your computer, and the one built into your phone.
Nothing to set up
Your workspace is already waiting in Atrium, in whichever browser you happen to be at — no servers, no ports, nothing to copy.
- Go to atrium.cowork24.net.
- Sign in with your usual work account.
- Pick a room from the rail on the left.
iPhone, and the mail app built into any phone
On Android, install the app — it is the whole workspace, not only mail. On an iPhone, or if you would rather install nothing, the browser does everything the app does apart from keeping a call alive in your pocket and ringing you when one arrives.
- Open atrium.cowork24.net in your phone's browser.
- Sign in with your work account.
- Add it to your home screen so it opens like an app.
The mail app built into your phone cannot sign in through our single sign-on — it only offers the providers it already knows about. If you need that app specifically, email the admins: it needs a separate device password, which they will issue for you.
Thunderbird
Thunderbird signs you in through the same single sign-on as everything else, so you never type your mail password into it — you just approve the sign-in in a browser window.
- Add an account: New → Existing Mail Account.
- Enter your name and full address, and leave the password field empty.
- Choose Configure manually and fill in the servers from the mail setup guide in your account portal.
- Set authentication to OAuth2 on both the incoming and the outgoing server.
Thunderbird stores the outgoing server separately. If you set OAuth2 on the incoming server only, receiving will work and sending will fail — change both.
Your account
You are in charge of your own account.
Change your password, turn on two-factor, see where you are signed in and create a password for a new device — without waiting on anyone.
Change your password
Pick a new one whenever you want, or after you have shared a device.
Two-factor authentication
Add a code from your phone so a stolen password is not enough.
Signed-in devices
See every active session and sign out the ones you do not recognise.
The Android app
Install Cowork24 for Android from the Apps page, which always has the current version.
Mail setup guide
The single sign-on settings for Thunderbird, step by step, with your servers filled in.
User guides
How to sign in, and every part of Atrium screen by screen. Read them or download a copy once you are signed in.
Built to be trusted
Private by default, and yours.
Your workspace runs on your company's own servers. Nothing here is rented from someone else's cloud.
One sign-in
The same account opens mail, files, calls and documents.
Two-factor
Turn on a code from your phone whenever you want.
Encrypted in transit
Every connection to every service is protected with TLS.
Signed mail
Messages carry SPF, DKIM and DMARC so they are trusted on arrival.
Ready when you are.
Sign in with your work account and everything is already set up and waiting for you.