Your sales rep lives in Slack. Your enterprise prospect lives in Microsoft Teams. The deal is moving fast, but every message requires a manual relay. Someone has to copy the conversation into an email, paste it into the other app, or schedule another call just to share context that should have flowed automatically.

This is not a rare edge case. It's the default state of modern B2B collaboration. Companies standardize on different platforms, and no one wants to abandon the tool their entire organization has already adopted. The result is friction — and friction kills deals, slows support, and frustrates partners.

DIY incoming webhooks and custom bot integrations exist as workarounds, but they introduce their own problems. Webhooks post messages with a generic label, stripping attribution and breaking the conversational feel. Custom bots require developer time to set up, maintain, and debug. They break when platforms update their APIs. And neither approach gives you bidirectional channel sync with sender name and avatar on both sides.

For a full overview of options, see our Slack to Teams bridge resource.

Why webhooks and DIY bots fall short

When a Slack webhook posts a message to Teams, it appears as "Incoming Webhook" or some generic bot name. The message lacks context about who sent it. Replies in Teams don't flow back to Slack. You end up with a one-way pipe that's better than nothing, but far worse than a real Slack to Teams integration.

Custom bots have more capability but require significantly more setup. You need to write code, host infrastructure, manage OAuth tokens, and handle rate limits for two different platforms simultaneously. A developer might spend days building something that breaks the next time Slack or Teams ships an API update.

There's also the matter of data. Both webhooks and most DIY bot implementations log messages or route them through third-party servers. For any organization that handles sensitive conversations — sales discussions, support tickets, M&A details — that's a real compliance risk.

How TetherChat's Slack to Teams bridge works

TetherChat is installed as an official app on Slack and Microsoft Teams. Bridged messages are delivered with the sender's name and avatar on the other side — not a DIY incoming webhook label or a single shared bot identity.

Step 1. Go to the Slack App Directory and add TetherChat to your workspace. A workspace admin approves the installation and grants the necessary permissions.

Step 2. In the Slack channel you want to connect, type /tether. Choose "Create New Tether" from the menu. You'll receive a unique Tether ID — a short code that identifies this connection.

Step 3. Install TetherChat from the Microsoft Teams App Store. Add it as a channel tab and paste the Tether ID from Slack in the configuration form. The two channels are now connected.

From this point forward, every message sent in the Slack channel appears in Teams with sender attribution — and every message sent in Teams appears in Slack. No additional steps, no maintenance, no developer required.

What people use this for

Sales teams use TetherChat to stay in Slack while their enterprise prospects stay in Teams. Both organizations install TetherChat in their workspace. Proposals, questions, follow-ups, and negotiation details stay in a single bridged conversation that both sides see in their preferred platform.

Customer support organizations connect internal support channels with the channels where their customers already live. A support rep working a Slack queue can respond directly to a Teams customer without switching apps or asking the customer to change their habits. Resolution times drop because friction drops.

Cross-company partnerships — especially during M&A due diligence, joint ventures, or long-term vendor relationships — use TetherChat to connect the two organizations without IT projects or platform migrations. Both sides keep their existing workspaces and tooling. The connection is channel-level and scoped, so sensitive conversations stay within the channels you intend to bridge.

A few common questions

Does TetherChat store my messages? TetherChat does not store message content. Messages are routed in real time; we retain routing metadata (such as message IDs for threads, edits, and reactions) and may briefly hold file attachments in encrypted transit storage during delivery.

What message types does TetherChat support? Text messages, rich formatting, threads, edits, deletes, reactions, and file attachments from human users. Messages from other bots and integrations are not relayed — only direct human messages flow across the bridge.

TetherChat is free during beta with no credit card required. Install TetherChat in your Slack workspace today and have a working Slack to Teams bridge set up before your next customer conversation.