The Office 365 exams are being retired and replaced with the new exam called Microsoft 365. The changes and the way to upgrade the existing certification and more information including many tips in this article.
Recently, 24th of September, Microsoft has announced new job role-based certifications. The new role-based replacing the current skills bases certifications, and new training for Microsoft 365.
from Microsoft Ignite 2019

“To determine key job roles in the industry, we began with market research, which helped us to define and refine the overall list of roles and skills. Then we consulted with industry subject matter experts who are working in the field—both inside and outside of Microsoft—and aligned our new training options and certification experiences with the defined roles and skills.”

Role-Based Certificate

The job role-based certifications are based on job role:

• Microsoft 365 Enterprise Administrator Expert
• Modern Desktop Administrator Associate
• Microsoft 365 Certified Fundamentals

Microsoft 365 Enterprise Administrator Role

The Microsoft 365 Enterprise Administrator Expert exam is required a few exams:

• Fundamentals – an optional exam and can be part of Azure Administrator
• Associate – required exam from Modern, Teamwork or Messaging or MCSE
• Expert – the required exams must be two exams and the Microsoft 365 Certified Enterprise Administrator Expert

Note: for those with the MCSE, they meet the workload requirement already and just need to pass both MS-100 and MS-101 exams.

If we can summarize, for Microsoft 365 Certified Enterprise Administrator Expert, it requires taking two exams MS-100 and MS-101 as well as one of the new workload certifications listed below, so three exams in total:

• Modern Desktop Administrator Associate
• Teamwork Administrator Associate
• Messaging Administrator Associate
• Security Administrator Associate
• MCSE: Productivity certification

Note: for other roles-based such as Security Administrator

Office 365 Exams Retired 

The following Office 365 exams are being retired on March 31, 2019:

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

This MCSA: Office 365 certification is being retired at the same time, for anyone interested in still completing this certification, they have until the end of March 2019 to pass both exams.

Office 365 upgrade or transition exam?

While the two new exams replace the Office 365 exam: 70-346 and 70-347 because of the differences there will be no upgrade path to the new Microsoft 365 roles.
If you’ve MCSA Office 365 you will need to take both MS-100 and MS-101 to obtain the new Microsoft 365 Enterprise Administrator role.
The new exams will cover some of the existing Office 365 content as well as the additional components including Windows 10, Enterprise Mobility + Security and how these integrate across Microsoft 365.

From the fields

• Exam MS-100 and MS-101 can be good for those that have implemented Office 365 already, probably taking MS-100 first.
• Microsoft 365 is an opportunity for IT Pros to standout in the job market and get a head start. In the resources section below there are getting started resources, as well as exam prep presentations for both the MS-100 and MS-101 exams.
• For someone who just starting now with Office 365 certification, it might be worth waiting for news on additional roles and any related announcements. Microsoft 365 Certified: Fundamentals (Exam MS-900).

Resources

• Microsoft Learning Blog
• Start learning Microsoft 365
• Take Our New Beta Exams MS-100 & MS-101
• Skill up and stand out, with new role-based training and certification
• Microsoft 365 Enterprise Admin role-based exam prep: MS-100 Identity & Services
• Microsoft 365 Enterprise Admin role-based exam prep: MS-101 Mobility & Security