Renew Exchange On-Premise SMTP Transport Certificates

I need to renew my certificate - Is it possible to get a 3 months free cert? what is the procedure of getting the cert? Please help

Yes, but... you shouldn't see it as a three months free certificate. It's an automatic renewal system you set up and forget about. There are several pieces of software to obtain what you desire, start reading these articles:

ACME Client Implementations - Let's Encrypt (scroll down to the Windows section)

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