There is no direct Trello and Outlook integration today. Trello's own add-in for Outlook was retired in December 2022, and Atlassian's Outlook guide now covers one thing: showing your cards with due dates on your Outlook calendar. To get email into Trello, you forward it to your board's own email address, which makes a card. Power Automate, Zapier or an Outlook add-in from another maker can do more. Where it stops: each email makes a new card, the calendar is view only, a changed due date doesn't move the Outlook event on its own, and a client's reply in Outlook never updates the card. AI agents do that part.
What a Trello and Outlook integration has to do
Many small teams track client work on Trello boards while the work itself arrives by email in Outlook. A client sends the missing file, asks for a change or says yes, and the card stays where it was until someone opens Trello and updates it.
So connected has to mean two things. Email that starts or changes work shows up on the right card, and due dates on the board show up where people plan their week. Trello's built-in tools cover part of each. The rest is copying by hand.
Four ways to connect Trello with Outlook
Most teams use the first two together.
Email-to-board
- How it works
- Each Trello board has its own email address. Forward an Outlook email to it, and the subject becomes the card title, the body becomes the description and attachments come along. Labels and members can be added with # and @ in the subject.
- Good for
- Teams that want client requests on the board without typing them in again.
- Where it breaks
- Each forward makes a new card. Replies in the same thread become comments only for 7 days; after that they make new cards. Emails over 10 MB, with attachments, make no card. Anyone with the address can make cards as you.
The Trello calendar in Outlook
- How it works
- In a board's Calendar view, you turn on Sync to personal calendar and copy the link. Outlook subscribes to it, so cards with due dates show as events.
- Good for
- People who plan their week in Outlook and want board deadlines next to their meetings.
- Where it breaks
- The board has to be in a Premium or Enterprise Workspace. It is a view-only feed, changes don't show right away, and Atlassian says Outlook for Mac can't add the subscription.
Power Automate or Zapier
- How it works
- Microsoft's Trello connector for Power Automate starts a flow when a new card is added to a board or list. Zapier has Trello steps like Card Due, Card Updated and Card Moved to List, and Outlook steps like Create Event and Update Calendar Event.
- Good for
- Teams with one fixed routine, like an Outlook event for each new card on one list.
- Where it breaks
- Microsoft's connector has no step for a changed card or due date. In an Atlassian Community answer from June 2026, the advice was to store each card's link to its Outlook event, or a changed date makes a second event.
An Outlook add-in from another maker
- How it works
- Since Trello's own add-in was retired, other makers offer one. Send to Trello by Kryl Solutions, in Microsoft's marketplace, makes a card from the email you have open.
- Good for
- People who want a button in Outlook in place of forwarding.
- Where it breaks
- It makes a new card each time, and it has only 3 ratings in Microsoft's marketplace. Some features need a paid plan from its maker.
Arkeo agents
- How it works
- Agents read client email in Outlook, find the card it belongs to, add the comment or file, check off the item, move the card to the next list, and flag cards that are late.
- Good for
- Teams that run client work on Trello and spend the week copying email into cards.
- Where it breaks
- Anything your rules keep for a person, like a client asking to change the scope, goes to the card's owner in one message.
How to set up the Trello and Outlook integration
These follow Atlassian's own guides. Open them for the screens.
- 1Copy your board's email address
Open the board menu, select Email-to-board, and copy the address under Email address for this board. Save it as a contact in Outlook so it is easy to forward to.
- 2Forward email with labels and members
Forward the client's email to the board. Add #labelname and the person's @username to the subject, so the card lands with the right label and owner. Keep it under 10 MB.
- 3Turn on the board's calendar feed
Check the board is in a Premium or Enterprise Workspace. Open Calendar view, select Sync to personal calendar, turn on the link and copy it.
- 4Subscribe to it in Outlook
In Outlook for Windows, open Calendar, add a calendar, and subscribe from the web. Paste the link, give it a name and color, and import it.
- 5
Add a flow only if you need two-way
If due date changes have to move Outlook events, build it in Power Automate or Zapier, and keep each card's link to its event so a change updates the event in place of making a new one.
Where the Trello Outlook integration stops
Email makes cards, not updates. Atlassian's guide says each email to the board makes a card, and replies in the thread become comments only for the first 7 days. After that, a client's reply makes a second card for the same job. Someone merges them, moves the card and checks off what the email settled.
Outlook doesn't hear back. The calendar feed is one way and view only. Atlassian says changes in Trello won't show in other apps right away, Outlook refreshes on its own schedule, and Outlook for Mac can't subscribe at all. Moving an event in Outlook does nothing to the card.
Flows need care. Microsoft's own Trello connector starts only when a new card is added, so a changed due date needs another tool. In an Atlassian Community thread from June 2026, the accepted answer said the feed can't prevent duplicates, and that a flow has to store each card's link to its Outlook event or each change makes a new event.
Trello no longer makes its own Outlook add-in. It was retired on December 15, 2022, as people in Microsoft's community forum noted at the time. Makers of the replacement add-ins still make a new card for each email.
So the work in the middle stays: reading each client email, finding its card, and keeping the board true.
The agents that do it
Each agent does one job from start to finish, in your own Trello and Outlook. Your team talks to them in Slack or Teams.
Client email gets an owner and a reply.
- Reads new mail in your shared mailboxas it lands
- Files it and sends it to the right personright away
- Flags mail no one has answeredevery day
Late work gets caught before the client asks.
- Checks open cards and due datesevery morning
- Sends deadline notices to clients and staffahead of each date
- Flags late work to the ownerright away
Know where each client stands without opening Trello.
- Counts cards by list, owner and due dateevery Monday
- Finds work that is late or not movingper card
- Sends the report to the ownersMonday morning
Questions
Is my customers' information safe?
Yes. Agents work in your own Trello and Outlook and see only what their job needs. Customer details never go into public AI. Agents connect to AI through business-grade connections audited under SOC 2.
Is there a Trello add-in for Outlook?
Not from Trello today. Its own add-in was retired in December 2022. Other makers list add-ins in Microsoft's marketplace, like Send to Trello by Kryl Solutions. Trello's built-in way is forwarding email to your board's address.
Can I sync Trello due dates with my Outlook calendar?
You can show them. A board's Calendar view gives a link that Outlook subscribes to, on Premium and Enterprise Workspaces. It is view only, so a moved date in Outlook doesn't change the card.
Why did my email reply make a new Trello card?
Atlassian says replies become comments only for 7 days after the card is made. After that, a reply to the board's address makes a new card.
What does it cost?
You get the price on the call, along with the hours it saves your team.