Last year I did 6 conversions from SBS2011 to ESS2016 / Exchange 2016 using your guides.
Their certificates will be up for renewal shortly and I would like to convert to Lets Encrypt.
So I need to be sure that the certificate will support:
domain.com.au autodiscover.domain.com.au mail.domain.com.au remote.domain.com.au
Also this Christmas I will be converting 8 sites, I would have preferred to upgrade to Essentials 2019 / Server 2019 / Exchange 2019 is this still not an option?