Find Out if an Update, Hotfix or KB is installed on a Windows Server Using Powershell

In Powershell versions 2 and above you can use the get-hotfix command to determine whether a particular update, KB or hotfix is installed on a Windows Server or client. Simply open Powershell and run the following command:

get-hotfix -id KBxxxxxx

Where KBxxxxxx is the name of the update you wish to search for.

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Find out which user owns an an Exchange email address using the Exchange Management Shell

In the Exchange Management Shell type the following where SEARCH_EMAIL_ADDRESS is the email address that you are looking for:

get-recipient -results unlimited | where {$_.emailaddresses -match “SEARCH_EMAIL_ADDRESS”}