Following exams which are the prerequisite for the MCSA Office 365 certification are being retired end of March 2019:

• 70-346: Managing Office 365 Identities and Requirements
• 70-347: Enabling Office 365 Services

Microsoft 365 Enterprise Administrator is the new certification whose content is even broader covering all the elements of Microsoft 365 and how they work together. It consists of following exams:

• MS-100: Microsoft 365 Identity and Services
• MS-101 Microsoft 365 Mobility and Security

Here are the other Microsoft 365 certifications available:

M365 Certified Fundamentals
Prove that you understand the options available in Microsoft 365 and the benefits of adopting cloud services, the Software as a Service (SaaS) cloud model, and implementing Microsoft 365 cloud service.

M365 Certified: Messaging Administrator Associate
Microsoft 365 Messaging Administrators deploy, configure, manage, and monitor messaging infrastructure, permissions, client access, mail protection, and mail flow in both on-premises, hybrid, and cloud enterprise environments.

M365 Certified: Teamwork Administrator Associate
Microsoft 365 Teamwork Administrators configure, deploy, and manage Office 365 workloads that focus on efficient and effective collaboration, such as SharePoint (online, on-premises, and hybrid), OneDrive, and Teams.

M365 Certified: Security Administrator Associate
Microsoft 365 Security Administrators proactively secure M365 enterprise and hybrid environments, implement and manage security and compliance solutions, respond to threats, and enforce data governance.

M365 Certified: Modern Desktop Administrator
Modern Desktop Administrators deploy, configure, secure, manage, and monitor devices and client applications in an enterprise environment.

M365 Certified: Enterprise Administrator
Microsoft 365 Enterprise Administrators evaluate, plan, migrate, deploy, and manage Microsoft 365 services.