This is Slack's main legal agreement that governs how businesses and their employees can use the Slack workplace messaging and collaboration platform. The most important thing to know is that Slack may use the messages, files, and data shared in your workspace to train and improve its AI features unless your organization's administrator explicitly opts out of this data use. If you work for an organization that uses Slack, ask your IT or legal team whether your workspace has opted out of AI training data use.
Technical Summary
Slack's Main Services Agreement (MSA) governs the contractual relationship between Slack Technologies, LLC (a Salesforce subsidiary) and Customer entities that purchase or use Slack's cloud-based collaboration services, establishing rights and obligations under a B2B framework where individual end users are governed through the Customer's acceptance of the MSA. The agreement imposes significant obligations on Customers to serve as the primary data controller for Customer Data, to obtain all necessary consents from end users, and to ensure compliance with acceptable use policies, while Slack retains broad discretion to modify, suspend, or terminate services with relatively limited notice requirements. Notable provisions include a mutual limitation of liability capping damages at fees paid in the prior 12 months, a carve-out permitting Slack to use aggregated and de-identified usage data for service improvement and business purposes even after agreement termination, and an AI/machine learning training use provision that allows Slack to process Customer Data to develop and improve AI features unless opted out. The agreement engages GDPR (Articles 6, 28, and 46) through its Data Processing Addendum (DPA) framework, CCPA/CPRA (Cal. Civ. Code §1798.100 et seq.) through its privacy policy incorporation, and implicates EU AI Act obligations given Slack's expanding AI feature set. Material compliance considerations include the adequacy of the Customer's data processing authority, the enforceability of the DPA as a GDPR-compliant data processing agreement, and the scope of Slack's reserved rights to use Customer Data for AI training purposes absent an explicit opt-out.
Slack can use your organization's messages, files, and other workspace data to train and improve its artificial intelligence features, unless your workspace administrator turns off this option.
If something goes wrong — such as a data breach or service failure — Slack's maximum financial responsibility to your organization is limited to the amount your organization paid Slack in the past 12 months, and Slack is never responsible for lost profits or indirect damages.
If your organization has employees or users in the EU or other regions with data protection laws, a separate Data Processing Addendum automatically applies to your use of Slack, setting out how Slack handles personal data as your organization's data processor.
When you connect other apps to Slack — like Google Drive, Salesforce, or Zoom — Slack is not responsible for what those apps do with your data, and their own separate legal terms apply.
Your organization owns the data you put into Slack, but you are granting Slack a broad license to access, copy, and use that data to run and improve its services.
Slack can suspend or cut off your organization's access to the platform at any time if it believes you have violated the agreement, including for not paying — and in some cases, it can do so without prior notice.
Your organization is legally responsible for ensuring that every employee or user who accesses Slack follows Slack's usage rules, and your organization can be held liable for what individual users do on the platform.
Slack can change what the service does — adding or removing features — and if you keep using Slack after being notified, you are legally agreeing to those changes.
Any legal disputes with Slack must be resolved through binding arbitration in San Francisco, California, under California law — meaning you generally cannot sue Slack in court or in your home jurisdiction.
Slack fees are non-refundable, and your subscription automatically renews every year (or whatever term you originally signed up for) unless you give 30 days' written notice before it renews.
Added April 27, 2026
Cross-platform context
See how other platforms handle AI Training Data Use and similar clauses.