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.

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”}