Microsoft Exchange 2019 Standard Edition
Limited to five mounted databases per server.
A mounted database is a database that's in use (an active mailbox database that's mounted for use by clients or a passive mailbox database that's mounted in recovery for log replication and replay). While you can create more databases than the described limits, you can only mount the maximum number of databases that are allowed by the edition of Exchange. Note that the recovery database doesn't count towards these limits.
The server editions are defined by a product key. When you enter a valid product key, the supported edition for the server is established.
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