While it's not a strict prerequisite, it is recommended that you earn your Microsoft 365 Fundamentals certification prior to training for other Microsoft 365 certifications.
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Microsoft provides two re-certification options for those who want to demonstrate continuous competence in these areas. You can demonstrate that you're staying current in the technology by either taking a re-certification exam or stay-current course within two years of earning your certification. As soon as you pass either the course or the exam, the expiration date on your certification will be extended two years from that date. For more information, please check out the FAQ on Microsoft's Certification Exam Policies page.