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Microsoft Outlook email add-in for Slack

With the Outlook add-in for Slack, you can send emails to Slack channels and direct messages (DMs) directly from your inbox. You can use the add-in from Outlook 2016 (or later) for Windows and Mac, Outlook for web, or the Outlook app for iOS or Android.

What to expect

  • The Outlook email add-in is only available for Office 365. It's not supported for on-premise Microsoft Exchange customers.
  • Only the Exchange mail protocol is supported. Outlook clients set up to retrieve messages with POP/IMAP are not supported.
  • On-premises SharePoint installations or Office 365 plans hosted on a Microsoft national cloud deployment (including Office 365 U.S. Government, Office 365 Germany, and Office 365 operated by 21Vianet in China) are not currently supported.

 

Install the Slack add-in to Outlook

  1. Head to the Slack for Outlook page in Microsoft AppSource.
  2. Click Get it now and follow the prompts.

Tip: If you're unable to install the add-in yourself, contact an Office 365 administrator at your company for help.

 

Connect Outlook to your Slack account

Once the add-in has been installed, connect your Outlook account to a Slack workspace. If you're part of an Enterprise Grid org, you can connect any workspaces you're a member of.

Connect Outlook to a workspace

Desktop

Browser

  1. Open the Outlook desktop app.
  2. Click the Slack icon in the toolbar.
  3. Select Connect to Slack.
  4. If you're not signed in to Slack, you'll be prompted to do so.
  5. Click Allow to grant Outlook access to Slack.

Legacy inbox view

  1. Open Outlook.
  2. Click Send to Slack from the toolbar.
  3. Click Connect to Slack.
  4. If you're not signed in to Slack, you'll be prompted to do so.
  5. Select Allow
  6. Click Allow to grant Outlook access to Slack.

New inbox view

  1. Open Outlook.
  2. Open an email and click the  three dots icon.
  3. Select Slack for Outlook.
  4. If you're not signed in to Slack, you'll be prompted to sign in.
  5. Select Allow
  6. Click Allow to grant Outlook access to Slack. 

Tip: If you're using the new inbox view, you can add a Send to Slack action to the top-level action bar from the Customize Actions section of Outlook settings.

Connect another workspace

If you're a member of more than one Slack workspace, or you're a member of an Enterprise Grid org, you can easily connect additional workspaces.

Desktop

Browser

  1. Open Outlook.
  2. Click the Slack icon in the toolbar.
  3. Click the arrow icon to the right of your workspace name.
  4. Select Connect another workspace.
  5. Click Allow
  6. Open the dropdown menu in the top-right and choose a workspace, or click Add another workspace.
  7. Click Allow to grant Outlook access to the workspace.
  1. Open Outlook, then open an email.
  2. Click the Slack icon.
  3. Click the arrow icon to the right of your workspace name.
  4. Select Connect another workspace.
  5. Click Allow
  6. Open the dropdown menu in the top-right and choose a workspace, or click Add another workspace.
  7. Click Allow to grant Outlook access to the workspace.

Note: If you run into problems connecting Slack and Outlook, try using Google Chrome or Mozilla Firefox, then restart the Outlook desktop app. If you’re using Internet Explorer, adjusting your browser’s security zone setting to Medium or lower should clear up any issues.

 

Send emails to Slack

Now that you're connected, you're ready to start sending emails to Slack channels and DMs.

Desktop

Browser

Mobile

  1. Open Outlook, then open an email.
  2. Click the Slack icon.
  3. Start typing the name of a channel or person, then select it from the dropdown menu. Add a message and include attachments, if you'd like.
  4. Click Send to Slack.
  1. Open Outlook, then open an email.
  2. Click the  three dots icon and select Send to Slack.
  3. Start typing the name of a channel or person, then select it from the dropdown menu. Add a message and include attachments, if you'd like.
  4. Click Send to Slack.
  1. Open the Outlook app, then open an email.
  2. Tap the  three dots icon.  
  3. Tap Send to Slack
  4. Start typing the name of a channel or person, then select it from the dropdown menu. Add a message and include attachments, if you’d like.
  5. Tap Send to Slack.

Note: The header and body of an email sent to Slack cannot exceed 1MB, or 30MB when combined with attachments. Emails can include up to 20 attachments.

Tip: Emails in Slack are treated as files and will count towards your workspace's file storage limit.

 

Disconnect Outlook and Slack

If you no longer want to send emails from Outlook to Slack, you can disconnect your account.

  1. Sign in to Outlook from the desktop app. 
  2. Click Get add-ins from the toolbar.
  3. Click My add-ins.
  4. Find Slack for Outlook and click the  three dots icon.
  5. Click Remove.
Who can use this feature?
  • All members and some guests
  • FreeStandardPlus, and Enterprise Grid plans

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