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Param($migrationCSVFileName = "migration.csv")

function O365Logon{

#Check for current open O365 sessions and allow the admin to either usethe existing session or create a new one

$session = Get-PSSession | ?{$_.ConfigurationName -eq 'Microsoft.Exchange'}

if($session -ne $null){

$a = Read-Host "An open session to Office 365 already exists. Do you want to use this session? Enter y to use the open session, anything elseto close and open a fresh session."

if($a.ToLower() -eq 'y'){

Write-Host "Using existing Office 365 Powershell Session." -ForeGroundColor Green

return}$session | Remove-PSSession

}Write-Host "Please enter your Office 365 credentials" -ForeGroundColor G

reen$cred = Get-Credential

$s = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUrihttps://ps.outlook.com/powershell -Credential $cred -Authentication Basic -AllowRedirection

$importresults = Import-PSSession -Prefix "Cloud" $s}

function Main{

#Verify the migration CSV file existsif(!(Test-Path $migrationCSVFileName)){

Write-Host "File $migrationCSVFileName does not exist." -Foregro

undColor Red Exit}

#Import user list from migration.csv file$MigrationCSV = Import-Csv $migrationCSVFileName

#Get mailbox list based on email addresses from CSV file$MailBoxList = $MigrationCSV | %{$_.EmailAddress} | Get-CloudMailbox$Users = @()

#Get LegacyDN, Tenant, and On-Premise Email addresses for the usersforeach($user in $MailBoxList)

{$UserInfo = New-Object System.Object

$CloudEmailAddress = $user.EmailAddresses | ?{($_ -match 'onmicrosoft') -and ($_ -cmatch 'smtp:')}

if ($CloudEmailAddress.Count -gt 1){

$CloudEmailAddress = $CloudEmailAddress[0].ToString().ToLower().Replace('smtp:', '')

Write-Host "$user returned more than one cloud email add

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ress. Using $CloudEmailAddress" -ForegroundColor Yellow}else{

$CloudEmailAddress = $CloudEmailAddress.ToString().ToLower().Replace('smtp:', '')

}

$UserInfo | Add-Member -Type NoteProperty -Name LegacyExchangeDN -Value $user.LegacyExchangeDN

$UserInfo | Add-Member -Type NoteProperty -Name CloudEmailAddress -Value $CloudEmailAddress

$UserInfo | Add-Member -Type NoteProperty -Name OnPremiseEmailAddress -Value $user.PrimarySMTPAddress.ToString()

$UserInfo | Add-Member -Type NoteProperty -Name MailboxGUID -Value $user.ExchangeGUID

$Users += $UserInfo}

#Check for existing csv file and overwrite if neededif(Test-Path ".\cloud.csv"){

$delete = Read-Host "The file cloud.csv already exists in the cu

rrent directory. Do you want to delete it? Enter y to delete, anything else to exit this script."if($delete.ToString().ToLower() -eq 'y'){

Write-Host "Deleting existing cloud.csv file" -ForeGroundColor Red

Remove-Item ".\cloud.csv"}else{

Write-Host "Will NOT delete current cloud.csv file. Exiting script." -ForeGroundColor Green

Exit

}}$Users | Export-CSV -Path ".\cloud.csv" -notype(Get-Content ".\cloud.csv") | %{$_ -replace '"', ''} | Set-Content ".\cl

oud.csv" -Encoding UnicodeWrite-Host "CSV File Successfully Exported to cloud.csv" -ForeGroundColo

r Green

}

O365LogonMain