Microsoft documentation seems to indicate that the only difference between Exchange Server 2019 Standard and Enterprise is the number of mounted databases per server. I know you used to need Enterprise edition to do High Availability (HA). I no longer see that requirement. Can Exchange Server 2019 Standard do HA?
You can configure high availability, but it should not exceed the number of databases provided by the standard version. Maximum can configure 5 databases, and should leave all active on one server (active / passive)
