What are the most popular business instant messaging software in 2026?

As of my last update in October 2023, I can't provide specific information about the most popular business instant messaging software in 2026. However, I can mention some platforms that were widely used and likely to continue being popular in the business communication space:

1. **Slack**: Known for its integrations and user-friendly interface, Slack has been a staple for team communication.

2. **Microsoft Teams**: With its integration into the Microsoft 365 ecosystem, Teams has gained significant traction among businesses.

3. **Zoom**: While primarily known for video conferencing, Zoom has expanded its messaging capabilities and is popular for team collaboration.

4. **Google Chat**: Part of Google Workspace, it offers seamless integration with other Google services.

5. **Discord**: Originally aimed at gamers, Discord has found a place in business communication, especially for tech and creative teams.

6. **WhatsApp Business**: For small to medium-sized businesses, WhatsApp Business provides a way to communicate with customers effectively.

7. **Mattermost**: An open-source alternative that is popular among organizations looking for self-hosted solutions.

8. **Rocket.Chat**: Another open-source option that allows for customization and self-hosting.

9. **Flock**: A team communication tool that offers messaging, video calls, and integrations.

10. **Chanty**: A simple team chat app that focuses on productivity and task management.

To get the most accurate and up-to-date information about the most popular business instant messaging software in 2026, I recommend checking industry reports, user reviews, and technology news sources closer to that date.