Exchange check current version

Via Powershell

Get-Command exsetup.exe | foreach {$_.FileVersionInfo}

Via Exchange Management Shell

Get-ExchangeServer | select Name, AdminDisplayVersion

Get-ExchangeServer | fl name,AdminDisplayVersion

Get-ExchangeServerBuildNumbers

The AdminDisplayVersion value shows the Exchange version in the format : “MajorVersion.ServicePack.CumulativeUpdate/UpdateRollup.MinorVersion”

Via webbrowser (if maps is enabled) :

https://<serverFQDN>/mapi/emsmdb/

For Office 365 use https://outlook.office.com/mapi/emsmdb/

Now you can compare the version number in this Microsoft article and find the Exchange server build :

https://technet.microsoft.com/en-gb/library/hh135098(v=exchg.150).aspx

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