“Slack Enterprise+ Choose it if collaboration experience, integrations, and enterprise security are priorities, and you're comfortable with a SaaS deployment model.”
“Mature collaboration ecosystem”
“Native Enterprise+ capability”
“Organization-level audit logs.”
“Multiple SAML configurations on Enterprise+.”
“Self-hosting | No | No | Yes”
“Slack's more advanced DLP, legal holds, information barriers, audit logs, and discovery capabilities are Enterprise+ features.”
“Audit logs retained for a maximum of two years as of April 30, 2026.”
“Microsoft Teams Best overall Choose it if you want mature compliance workflows, eDiscovery, centralized identity governance, and integration with Microsoft Purview.”
“Teams has a particularly mature compliance ecosystem through Microsoft Purview.”
“Centralized audit logging through Microsoft Purview.”
“Audit Premium supports extended audit retention, including up to 10 years with the appropriate licensing.”
“Retention policies for chats and channel messages.”
“Native Microsoft Entra ID integration.”
“Mature investigation capabilities”
“Teams messages, SharePoint files, OneDrive files, and meeting recordings have different retention mechanisms. You need to configure each relevant workload.”
“Self-hosting | No | No | Yes”
“Mattermost Enterprise Choose it if you need self-hosting, infrastructure control, data sovereignty, or isolated deployment environments.”
“Strongest deployment flexibility”
“Mattermost can be deployed in infrastructure controlled by the organization, including self-hosted environments.”
“Deployment flexibility”
“System and application audit logs.”
“SAML 2.0.”
“However, self-hosting also means your organization assumes more responsibility for infrastructure security, backups, monitoring, and operational evidence.”