<#
Exchange On-Prem, Exchange Online
Define mailboxes for migration batch programatically without CSV file
$MigUsers = ConvertTo-CSVDataByte "user1@abc.cz","user2@abc.cz"
New-MigrationBatch -Local -Name LocalMove1 -CSVData $MigUsers -TargetDatabases MBXDB2
#>
 
function ConvertTo-CSVDataByte {
    Param(
        [Parameter(Mandatory = $true)]
        [ValidateNotNull()]
        [String[]]$Emails
    )
    $CSVData = [system.Text.Encoding]::Default.GetBytes('"EmailAddress"')
    $CSVData += [system.Text.Encoding]::Default.GetBytes("`n")
    for ($i = 0; $i -le $Emails.Length - 1; $i++) {
        $CSVData += [system.Text.Encoding]::Default.GetBytes('"' + $Emails[$i] + '"')
        if ($UPNs.Length - 1 -ne $i) {
            $CSVData += [system.Text.Encoding]::Default.GetBytes("`n")
        }
    }
    return $CSVData
}