How to Combine PEM Keys and Certificates for Microsoft Exchange Usage
Also good for Java stuff
Once I've obtained free SSL certificates from Let's Encrypt, preferrably wildcard ones, as described in another article here at Mimar - Let's Encrypt Wildcard Certificates On FreeBSD With BIND DNS Validation - I'm going to combine them into single PFX file so it can be used by Microsoft Exchange to secure IMAP, SMTP, POP and IIS services.