Delete unneeded logs on the exchange server 2013
https://social.technet.microsoft.com/wiki/contents/articles/31117.exchange-201320162019-logging-clear-out-the-log-files.aspx
Get-ChildItem -Path 'C:\inetpub\logs\LogFiles\*' -Include *.log -Recurse | Where-Object {$_.LastWriteTime -le [datetime]::Today.AddDays(-30)} | Remove-Item -Confirm:$false
Get-ChildItem -Path 'C:\Program Files\Microsoft\Exchange Server\V15\Logging\*' -Include *.log -Recurse | Where-Object {$_.LastWriteTime -le [datetime]::Today.AddDays(-30)} | Remove-Item -Confirm:$false
Get-ChildItem -Path 'C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\Logs\*' -Include *.log -Recurse | Where-Object {$_.LastWriteTime -le [datetime]::Today.AddDays(-30)} | Remove-Item -Confirm:$false