How to find your Microsoft Exchange build number
When documenting your environment, it’s important to keep track of the build number of your Exchange server. To get the correct build number installed on your Exchange server, you can check the file version of Exsetup.exe. You can do this by changing your PowerShell directory to the location of this file (likely the bin folder under your Exchange installs) and running the following command:
Get-Command Exsetup.exe | ForEach {$_.FileVersionInfo}
This will give you the correct build number installed on your Exchange server.
If you want to view the CU build number of all Exchange servers in your organization, you can use the following command in the Exchange Management Shell:
Get-ExchangeServer | Format-List Name,Edition,AdminDisplayVersion
For a list of the build numbers use the link below.
Exchange Server build numbers and release dates | Microsoft Learn