As you might know, I have earned quite some certifications from Microsoft. Today I again was able to renew one of my existing certifications. Now-a-days you do not have to re-do the whole exam. You can just do a simple online assessment with 20-something questions. If you pass this FREE online assessment, your certificate is valid for another year.
More details can be found at https://docs.microsoft.com/en-us/learn/certifications/renew-your-microsoft-certification.