n8n Outlook Trigger 2026: OAuth Credentials & Workflow Setup

TL;DR: Microsoft 365 email becomes a real workflow trigger

• Use the n8n Outlook node and Graph API to route shared mailbox traffic, automate approvals, and run timed follow-ups via automation workflows.

• Categorise inbound mail by subject, sender, and content; push records to your CRM and notify the right person in Teams or Slack.

• Replace manual approval chains with Teams buttons that update SharePoint and trigger downstream actions.

• Basic alerts are DIY; Azure AD app registration, delegate permissions, and compliance setups need an n8n agency.

• Pair Outlook flows with a custom AI product for smarter triage and reply drafting.

What the n8n Outlook Integration Does

The n8n Microsoft Outlook node connects to Outlook via the Microsoft Graph API. It can send emails, read messages, manage drafts, move messages between folders, and respond to calendar events. A trigger node watches for new emails and fires workflows in real time.

For teams on Microsoft 365, Outlook is not just email-it is the entry point for most business processes. Purchase approvals arrive as emails. Client briefs land in shared mailboxes. Meeting follow-ups require manual note distribution. Each of these is a workflow waiting to be automated.

n8n automation handles the repetitive parts. Incoming emails trigger CRM updates, shared mailbox messages route to the right team, and scheduled emails send without anyone clicking "compose." This is practical n8n workflow automation for Microsoft-centric organizations.

Three Outlook Workflow Examples

1. Shared Mailbox Router

Trigger: new email arrives in a shared Outlook mailbox (e.g., info@ or support@). Action: n8n analyzes the subject line and sender domain, categorises the email (sales inquiry, support request, partnership), and forwards it to the appropriate team member. It also creates a record in the CRM and sends a Slack notification. This n8n workflow example eliminates the shared mailbox bottleneck.

2. Approval Request Automation

Trigger: email arrives with "Approval Request" in the subject line. Action: n8n extracts the request details, posts a formatted message to a Microsoft Teams channel with approve/reject buttons via a webhook. When the approver responds, n8n sends the reply email automatically and updates the status in SharePoint. A common n8n use case for procurement and HR teams.

3. Client Follow-Up Sequences

Trigger: deal stage changes to "Proposal Sent" in HubSpot. Action: n8n waits three business days using a delay node, then checks if the client has replied. If no reply, it sends a follow-up email from Outlook with personalized content referencing the proposal. After two follow-ups with no response, it alerts the account manager via Teams. Automated follow-ups that feel human.

How Setup Works

Connecting Outlook to n8n uses Microsoft OAuth2 via Azure AD. You register an application in the Azure portal, configure API permissions for Mail.Read, Mail.Send, and Calendars.Read, and generate a client secret. In n8n, you add these credentials and authorise access to the mailbox.

The Microsoft Outlook Trigger node polls for new messages. The Outlook node supports sending, reading, moving, and deleting messages. Both work with personal mailboxes and shared mailboxes in Microsoft 365.

n8n templates for Outlook workflows cover email routing, approval automation, and calendar sync patterns that work out of the box for Microsoft 365 environments.

When to DIY vs Hire an Agency

Basic Outlook automations-sending a notification when an email arrives, forwarding messages based on sender-are manageable as DIY projects. The n8n interface makes it straightforward.

Microsoft 365 integrations can be complex. Azure AD app registration, permission scoping, and token refresh handling require technical knowledge. Shared mailbox access, delegate permissions, and compliance requirements add layers of configuration that are easy to get wrong.

If your organization has strict security policies or you need workflows touching multiple Microsoft 365 services, an n8n agency with Microsoft integration experience avoids costly missteps.

Modernize Your Email Workflows

Related guides:

• automate email sequences with n8n

• automate onboarding sequences with n8n

Outlook handles your communication. n8n handles the work that follows. From routing shared mailbox emails to automating approval chains to sending intelligent follow-ups, n8n integrations turn Microsoft 365 email into an automation platform. If email-driven processes are slowing your team down, the fix is workflow automation, not more inbox discipline.