%ExchangeInstallPath%TransportRoles\Logs\MessageTracking Message tracking log (default expiry 45 days)
Exchange management shell
Set-TransportService Mailbox01 -MessageTrackingLogPath “D:\Hub Message Tracking Log” -MessageTrackingLogMaxFileSize 20MB -MessageTrackingLogMaxDirectorySize 1.5GB -MessageTrackingLogMaxAge 45.00:00:00 (45 days)
