Slack AI integration with Microsoft Teams: The 2025 guide

There’s a good chance your team runs on Slack. It’s the digital home for quick chats, project updates, and those all-important GIFs. But what happens when your customers, partners, or even other departments are living in Microsoft Teams? You end up with a digital wall between you, leading to a whole lot of context switching, missed messages, and slow, frustrating communication.

The issue isn’t just about two different chat apps. It’s a real bottleneck that slows down how you help customers and work with partners. The answer isn’t just to copy-paste messages from one app to the other. A smart Slack AI integration with Microsoft Teams does more than that, it adds an intelligent layer to handle routine questions, pull knowledge from all your company docs, and generally make life easier.

In this guide, we’ll walk through the different ways to connect these two platforms, look at how AI fits into the picture, and help you figure out what makes the most sense for your team.

Understanding Slack vs. Teams

Before we get into the nuts and bolts of integration, let’s quickly cover why so many companies end up using both. It really boils down to what each tool is good at and the ecosystems they’re part of.

Why teams use Slack

Slack is the king of channel-based messaging. People love it for its simple, clean feel and the massive library of apps you can plug into it. It’s perfect for fast-paced, informal chats, which is why you see it everywhere in tech companies and startups. It’s built to keep internal teams moving quickly without getting bogged down by email. You can even connect it with tools like eesel AI for Slack to make it even more useful.

Why teams use Microsoft Teams

Microsoft Teams is the all-in-one communication tool that’s baked right into the Microsoft 365 world. Its biggest plus is how smoothly it works with SharePoint, OneDrive, and all the Office apps. This makes it the default choice for larger companies that are already deep in the Microsoft ecosystem. It’s a solid platform for scheduled meetings, more formal projects, and heavy-duty file sharing. And yes, you can bring AI into the mix here too with an eesel AI integration for Microsoft Teams.

The challenge of using both platforms

The problem starts when your team on Slack needs to help customers or work with partners who are on Teams. This disconnect creates some very familiar headaches:

• Manually copying and pasting questions and answers between the two apps.

• Missing important pings because you’re looking at the wrong screen.

• Losing the thread of a conversation because it’s split across platforms.

• Response times that are just plain slow, leaving everyone feeling a bit annoyed.

An AI-powered integration helps solve this by doing more than just connecting the two platforms. It adds a layer of intelligence that can manage, route, and sometimes even resolve conversations on its own. It turns a point of friction into a much smoother process.

Common ways to integrate Slack and Microsoft Teams

There are a few ways to build a bridge between Slack and Teams. Each has its own pros and cons, so let’s walk through them, starting with the most basic.

Method 1: Use native calling apps

Slack has an official Microsoft Teams Calls app, which sounds great on the surface. This integration lets you type a simple slash command in a Slack channel to start or join a Teams meeting.

It’s a handy little feature, but it has one major limitation: it only works for video calls. It does absolutely nothing for messages, threads, files, or any other kind of text conversation. If your goal is to provide chat support or collaborate on a project, this isn’t the solution. It’s really just for teams that need a quick way to hop on a video call together.

Method 2: Use automation platforms like Zapier

The next logical step for many is to try a workflow automation tool like Zapier or Appy Pie. You can set up a rule that says, "When a new message is posted in this Teams channel, post it in that Slack channel."

While this seems like a solid workaround, it often ends up being more trouble than it’s worth. These workflows break easily. If someone changes a channel name, the whole thing falls apart. More importantly, they just don’t capture the flow of a real conversation. Things like message threads, edits, deleted messages, and emoji reactions get lost along the way. You’re left with a clunky, disjointed feed that’s maybe okay for simple, one-way alerts, but not for actual back-and-forth support.

Method 3: Use third-party connector tools

This leads us to dedicated connector tools. Companies like Thena and Clearfeed have built apps designed specifically to mirror conversations between Slack and Teams. When someone posts in a Teams channel, it shows up almost instantly in a connected Slack channel, and vice versa.

This is a huge step up for real-time support, as it keeps the conversation in one place. But these tools have a big blind spot: they only pass messages back and forth. They don’t do anything to actually help answer the question. Every single message from a customer on Teams still becomes a manual task for someone on your team in Slack. You’ve closed the communication gap, but you haven’t done anything to reduce the actual workload.

Moving beyond sync: The role of AI in integration

Just connecting two platforms isn’t the challenge anymore. The real win is making that connection smart. This is where an AI platform offers a much more modern solution, moving from simply mirroring messages to actively resolving them.

How AI automates frontline support

Instead of just dumping a message from Teams into a busy Slack channel, an AI-powered platform can jump in first. It reads the message, understands what the person is asking for, and can provide an immediate, accurate answer from your company’s knowledge base.

This is a totally different way of thinking compared to connector tools. While they make sure every message creates a new task for a human, the goal of a real Slack AI integration with Microsoft Teams is to automatically handle the 30-50% of questions that are repetitive and easy to answer. This frees up your team to spend their time on the tricky problems that actually need their brainpower. It’s about automating the simple stuff, not just passing it along.

This workflow demonstrates how a Slack AI integration with Microsoft Teams can automate support by analyzing tickets and providing instant resolutions.

Unify knowledge across platforms

Another downside of basic connectors is that they only know about what’s happening in the chat platforms. An intelligent AI platform, however, can plug into your entire universe of company knowledge.

For example, eesel AI can learn from everything, your old Zendesk tickets, your Freshdesk macros, your internal wikis in Confluence or Notion, and even your shared Google Docs. This means the AI gives consistent, correct answers whether the question comes from Slack or Teams, because it’s pulling from a single, unified source of truth.

This infographic shows how a Slack AI integration with Microsoft Teams unifies knowledge from various sources like Zendesk, Confluence, and Google Drive to provide consistent answers.

Power intelligent workflows

A truly useful Slack AI integration with Microsoft Teams should do more than just answer questions. It should be able to do things. Modern AI platforms can be set up to perform tasks based on what’s being discussed.

For instance, an AI agent from eesel can triage a new request by automatically tagging it in your help desk, escalate a serious issue to the right on-call engineer, or even look up an order status from your Shopify store and post the update right in the chat. This turns your integration from a simple message forwarder into a powerful tool for automating work.

Building an intelligent integration with eesel AI

eesel AI was built specifically to provide this kind of intelligent, automated integration. It goes way beyond just syncing messages to give you a complete solution for cross-platform support.

Get your integration running in minutes

One of the most frustrating parts of new software is the setup. A lot of AI platforms make you sit through sales calls and demos just to see the product, followed by weeks of guided onboarding. With eesel AI, you can connect your help desk, chat tools, and knowledge bases with a few clicks and be live the same day. The platform is self-serve, so you can get started for free and configure everything yourself, on your own schedule.

This image shows the simple, self-serve workflow for setting up a Slack AI integration with Microsoft Teams using eesel AI, from connecting data to going live.

Test your integration with powerful simulations

Rolling out a new tool that talks to your customers can feel a bit nerve-wracking. How can you be sure it will work the way you want it to? eesel AI gets rid of that guesswork with its simulation mode. You can test your AI setup on thousands of your own past support tickets in a safe environment. This shows you exactly how the AI will perform, gives you a good forecast of your resolution rate, and lets you tweak its behavior before it ever talks to a real person. It’s a risk-free way to launch with confidence.

A screenshot of the eesel AI simulation mode, a key feature for testing a Slack AI integration with Microsoft Teams before it goes live.

Stay in control with a customizable workflow engine

Handing conversations over to an AI can feel like a leap of faith. That’s why eesel AI gives you fine-grained control over the whole process. You can define exactly which topics the AI is allowed to handle, maybe starting with simple things like "password resets" and then expanding its scope as you get more comfortable. You can also customize the AI’s personality, tone of voice, and the specific actions it can perform, making sure it always feels like a natural extension of your team.

This image displays the customization options in eesel AI, allowing users to control the behavior of their Slack AI integration with Microsoft Teams.

Platform pricing

Price is always a factor, and it can vary a lot between these different tools. Here’s a simple breakdown to help you compare.

Slack pricing

Slack’s pricing is based on the number of users and adds more features as you go up the tiers.

Plan	Price (Billed Annually)	Price (Billed Monthly)	Key Features
Pro	$7.25 /user/month	$8.75 /user/month	Unlimited message history, unlimited integrations, group huddles.
Business+	$12.50 /user/month	$15 /user/month	Advanced AI features, SAML-based SSO, data exports.
Enterprise Grid	Custom	Custom	Enterprise-grade security & compliance, unlimited workspaces.

Microsoft Teams pricing

Microsoft Teams’ pricing is often bundled into a Microsoft 365 subscription, which can make it a good deal for companies already using those tools.

Plan	Price (Billed Annually)	Key Features
Microsoft Teams Essentials	$4.00 /user/month	Unlimited group meetings, 30 hours per meeting, 10 GB cloud storage.
Microsoft 365 Business Basic	$6.00 /user/month	Includes Teams, Exchange, OneDrive, SharePoint.
Microsoft 365 Business Standard	$12.50 /user/month	Everything in Basic + desktop versions of Office apps.

eesel AI pricing

eesel AI’s pricing is designed to be predictable. Instead of charging per resolved ticket, which can lead to surprise bills during a busy month, the pricing is based on features and a generous number of monthly interactions.

Plan	Price (Billed Monthly)	Key Features
Team	$299 /month	Up to 1,000 AI interactions/mo, train on docs, Slack integration.
Business	$799 /month	Up to 3,000 AI interactions/mo, train on past tickets, MS Teams, AI Actions.

This model means your costs stay predictable, even when you’re growing.

Resolving issues vs. bridging platforms

The way we think about connecting Slack and Teams has changed. We started with basic calling apps and moved on to simple message connectors, but the real progress has come from AI-powered automation. The goal isn’t just to see a message from Teams show up in Slack anymore. It’s to have that message understood, handled, and resolved right away, without a human having to step in every single time.

By shifting to a more intelligent integration strategy, you can break down communication silos, free up your team from doing the same boring tasks over and over, and provide a great experience for everyone, no matter which chat app they prefer.

Ready to see how an intelligent Slack AI integration with Microsoft Teams could work for you? Start your free eesel AI trial and see if you can automate your first query in the next few minutes.