Where are Exchange logs location for Exchange Server Subscription Edition

In addition to the default locations, I would verify the effective transport log paths on the Exchange servers because these paths can be customized and may differ between servers.

This is especially useful in a multi-server environment where Message Tracking, SMTP protocol, and connectivity logs may not all be using the default Exchange installation path.

I recently published ExchangeLogPathManager.ps1 on GitHub for this purpose. The script can review supported Exchange transport log paths across multiple servers, compare source and target servers, preview proposed changes, apply supported path changes, and verify the resulting configuration.

GitHub repository:

https://github.com/Ceyhun-Kirmizitas/ExchangeLogPathManager.ps1

Detailed article and usage examples:

https://ceyhunkirmizitas.net/manage-exchange-server-transport-log-paths/

Hi Yvonne

Thank you for reaching out to Microsoft Q&A forum.

Based on your question, beside Q&A Assist support, I would like to share some additional information:

In Exchange Server Subscription Edition (SE), log locations are the same as recent on - premises Exchange versions (Exchange 2016/2019), unless they were manually changed in the configuration.

• Main Exchange logging folder: C:\Program Files\Microsoft\Exchange Server\V15\Logging\
• Mail flow & transport logs: %ExchangeInstallPath%\TransportRoles\Logs\

Includes message tracking, protocol (SMTP send/receive), agent, routing, and connectivity logs.

• IIS (OWA, ECP, EWS, ActiveSync) logs: C:\inetpub\logs\LogFiles\
• Exchange setup / upgrade logs: C:\ExchangeSetupLogs\ExchangeSetup.log

Please note that actual paths can be customized. To confirm the configured paths on your server, you can also check via Exchange Management Shell.

For official Microsoft documentation, please refer to: Transport logs in Exchange Server | Microsoft Learn

Checking log age using PowerShell

To check the oldest or newest log files in a specific folder (example: Message Tracking):

Oldest log files

Get-ChildItem "C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\Logs\MessageTracking" -Recurse |
Sort-Object LastWriteTime |
Select-Object -First 5 FullName, LastWriteTime

Newest log files

Get-ChildItem "C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\Logs\MessageTracking" -Recurse |
Sort-Object LastWriteTime -Descending |
Select-Object -First 5 FullName, LastWriteTime

To list logs older than a specific number of days (example: 30 days):

$Days = 30
Get-ChildItem "C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\Logs" -Recurse |
Where-Object { $_.LastWriteTime -lt (Get-Date).AddDays(-$Days) } |
Select FullName, LastWriteTime

To confirm configured log paths (in case defaults were changed):

Get-TransportService | Format-List *LogPath*

I hope these suggestions provide some helpful.

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Which powershell can I run to see the log age?