'Hypocritical' Error when Running New-Mailbox Tagged: Exchange This topic contains 2 replies, has 2 voices, and was last updated by Daniel Watson 10 months, 1 week ago. Author Posts April 20, 2016 at 3:04 am #38035 Daniel WatsonParticipant This is a cross post from /r/Powershell, then I realised I've never used the main globalcommunity! Hi everyone, look forward to working with you all. Down to business... I'm running: New-Mailbox -Alias alias.alias -Name "WhiteSpace Support" -FirstName ***** -LastName ***** -DisplayName "Display name" -UserPrincipalName "firstname.lastname@example.org" -Password (ConvertTo-SecureString -String 'Pa$$word1' -AsPlainText -Force) Which gives out the error: A parameter cannot be found that matches parameter name 'UserPrincipalName'. When I remove the -UserPrincipalName parameter, I get asked to define the UserPrincipalName manually. What gives? April 20, 2016 at 3:13 am #38036 Richard DiphoornParticipant What does this command gives you back: Get-Command New-Mailbox -Syntax April 20, 2016 at 4:48 am #38045 Daniel WatsonParticipant Ah, so the Syntax path I followed doesn't include that parameter, so need to define it afterwards. Author Posts You must be logged in to reply to this topic.