I have a script that i have written that will import users from a csv file I am runnign manually following command on ex management shell. I have created csv file mbinfo.csv which contains Alias,Name,UPN parag,Parag Jayant,Pjayant@xyz.com $Password=Read-Host "Enter Password" -AsSecureString [PS] C:\Windows\System32>import-csv mbinfo.csv | foreach {new-mailbox -alias $_ alias -Name $_.name -UserPrincipalName $_.UPN -Database "mailbox Database" -org Users -Password $Password} when i run this cmd, I am getting following error: New-Mailbox : Cannot bind argument to parameter 'UserPrincipalName' because it is null. i have copied above file in bulk.ps1 & run, I am getting following error. [PS] C:\Windows\System32>.\bulk.ps1 The term '.\bulk.ps1' is not recognized as a cmdlet, function, operable progra , or script file. Verify the term and try again. At line:1 char:10 + .\bulk.ps1 <<<<. when i run import -csv mbino.csv, result is Alias Name UPN ----- ---- --- parag Parag Jayant Pjayant@xyz.com Kindly advise.

I'd check that .csv and make sure there's no trailing whitespace in the UPN column heading.

I can create the mailbox by using the script you provided above, as mjolinor said, please double check your csv fileJames Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com