What is Microsoft Kaizala?

Microsoft Kaizala is a phone-number based, simple, and secure mobile chat app that enables you to connect and coordinate work across your network – your organization, vendors, partners, suppliers, and customers.

Kaizala is available with Office 365 and works on iPhone and Android phone.

Source: https://products.office.com/en/business/microsoft-kaizala

Microsoft Kaizala resources