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Let’s Encrypt certificate on Exchange servers

After Let’s Encrypt accept wildcard certificate we now can use this to build labs.

Ive been using sslforfree.com and zerossl.com if you dont want to use the ACME to get the certificate.

  1. Request the certificate from sslforfree or zerossl
  2. Validate the domain, DNS TXT record.
  3. Download the cer and key file
  4. Install OpenSSL from indy.fuglan.com/ssl/
  5. Run this command to “merge” the certificate and privatekey into an pfx:
openssl pkcs12 -export -in certificate.crt -inkey private.key -out yourcert.pfx
  1. Import this into your windows server.