Symptoms
Microsoft Exchange Server 2019 Sizing Calculator produces unsupportable results for mail.que database size without generating an error or warning message. The mail.que database that exceeds 2 TB is still supported.
Resolution
To fix this issue, install the Cumulative Update 5 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.
References
Learn about the terminology that Microsoft uses to describe software updates.
