#Import file and populate user fields
Function ReadCSV
 {
     Param([string]$fileName)
     $users = Import-Csv $fileName
     foreach ($user in $users){
         $flln = $user.'last name'.ToUpper().Substring(0)
         $db = ""
         if(($flln.CompareTo("A") -ge 0) -and ($flln.CompareTo("F") -le 0)){
            $db = "Student Store A-F"
         }
         elseif($flln.CompareTo("G") -ge 0 -and $flln.CompareTo("M") -le 0){
            $db = "Student Store G-M"
         }
         else{
            $db = "Student Store N-Z"
         }
         $ht  = @{
             'givenName'=$user.'first name'
             'sn'=$user.'last name'
             'displayName'= ($user.'first name' + " " + $user.'last name')
             'name' = ($user.'first name' + " " + $user.'last name')
             'alias'= ($user.'first name' + "." + $user.'last name')
             'samAccountName'= ($user.'first name' + "." + $user.'last name')
             'userPrincipalName' = ($user.'first name' + "." + $user.'last name' +"@mycollege.edu")
             'organizationalUnit' = "OU=Staging,OU=Student Accounts,DC=mycollege,DC=edu"
             'retentionPolicy' = "Student Policy"
             'office' = $user.office
             'database' = $db
         }
         Write-Output $ht
     }
 }

# User creation portion
Function CreateUser{
 Param($userInfo)
 $secureString = ConvertTo-SecureString "Changeme123" -AsPlainText –Force
 New-Mailbox  -Name $userInfo['name' ]`
 -Alias $userInfo['alias'] -UserPrincipalName $userInfo['userPrincipalName']`
 -SamAccountName $userInfo['alias'] -Database $userInfo['Database']`
 -FirstName $userInfo['givenName'] -LastName $userInfo['sn']`
 -OrganizationalUnit $userinfo['organizationalUnit']`
 -RetentionPolicy $userInfo['retentionPolicy']`
 -DisplayName $userInfo['DISPLAYNAME'] -Password $secureString -ResetPasswordOnNextLogon $true
  }

#Create mailbox
Function CreateMailbox{
 PROCESS
 {
 CreateUser $_
 }
}

 ReadCSV C:\\MailboxMove\Test.csv | CreateMailbox