function Show-Menu {
    param (
        [string]$Title = 'Alias Toolkit by Jeremy Berkleef'
    )
    Clear-Host
    Write-Host -ForegroundColor Green "================ $Title ================"
    
    Write-Host "1: Press" -NoNewline 
    Write-Host -ForegroundColor Cyan " '1' " -NoNewline
    Write-Host "to list the contents of a .csv."
    
    Write-Host "2: Press" -NoNewline
    Write-Host -Foregroundcolor Cyan " '2' " -NoNewline
    Write-Host "to apply the contents of a .csv to the currently logged in Exchange session."
    
    Write-Host "3: Press" -NoNewline
    Write-Host -ForegroundColor Cyan " '3' " -NoNewline
    Write-Host "to create a .csv file of aliases from Exchange based on a search term."
    
    Write-Host "4: Press" -NoNewline
    Write-Host -ForegroundColor Cyan " '4' " -NoNewline
    Write-Host "to use the legacy search script and output the alias list to console."

    Write-Host "Q: Press" -NoNewline
    Write-Host -ForegroundColor Red " 'Q' " -NoNewline
    Write-Host "to quit."
}


do
{
    Show-Menu
    $selection = Read-Host "Please make a selection"
    switch ($selection)
    {
    '1' {
        #Ask where the .csv is
        $CsvLocation = Read-Host -Prompt 'CSV path'

        #Print a new line
        Write-Host `n

        #Read the .csv and print it to console
        Import-Csv $CsvLocation | ForEach-Object {
            Write-Host -Foregroundcolor Red -Backgroundcolor White (Write-Output $_.Displayname);
            write-Host -foregroundcolor Green -Separator `n (Write-Output $_.EmailAddresses.Split(";"))
            }
        }
    '2' {
        #Ask where the .csv is and import the values into the Alias_List variable
        $CsvLocation = Read-Host -Prompt 'CSV path'
        $Alias_list = Import-Csv $CsvLocation

        #Print a new line
        Write-Host `n

        #Read the .csv, apply the aliases and print the resulting aliases
        Foreach ($Alias in $Alias_list) {
            Set-Mailbox -Identity $Alias.Displayname -EmailAddresses $Alias.EmailAddresses.Split(";")
        }

        #Get the mailboxes from Exchange Online and print the email addresses to confirm the changes.
        Foreach ($Alias in $Alias_list) {
            $addresses = (Get-Mailbox -Identity $Alias.Displayname).EmailAddresses
            if ($addresses -eq $Alias.EmailAddresses) {
                Write-Host "$($Alias.Displayname)" -NoNewline
                Write-Host -ForegroundColor Green "    Success!"
            }
            else {
                Write-Host "$($Alias.Displayname)" -NoNewline
                Write-Host -ForegroundColor Red "    FAILURE" 
            }
            }
        }
    '3' {
        #Ask the user what we're looking for and we're we're going to save the .csv
        $searchTerm = Read-Host -Prompt 'Input search query'
        $CsvSavePath = Read-Host -Prompt 'Input location to save .csv'
        
        #List Aliases and select 
        get-mailbox | Where-Object {$_.EmailAddresses -like "$searchTerm"}  | Select-Object Displayname,@{Name="EmailAddresses";Expression={$_.EmailAddresses}} | Export-Csv -NoTypeInformation $CsvSavePath
            
        #Remind the user that they need to fix the csv formatting.
        Write-Host -ForegroundColor Red -BackgroundColor Black "Please be sure to remember to format the .csv correctly before importing it back into an Exchange Server or Exchange Online"
        Write-Host `n
        Write-Host -BackgroundColor Black -ForegroundColor Blue "Before importing, delete the non-email addresses from the .csv and replace the spaces between addresses with ';'.`nThis is a safety measure to prevent applying an incompatible address."
        }
    '4' {
        # Ask the user what we need to search for
        $searchTerm = Read-Host -Prompt 'Input Query'

        #List Aliases 
        get-mailbox | Where-Object {$_.EmailAddresses -like "$searchTerm"}  |ForEach-Object{ 

        $host.UI.Write("White", $host.UI.RawUI.BackGroundColor, "`nUser Name: " + $_.DisplayName+"`n")

        for ($i=0;$i -lt $_.EmailAddresses.Count; $i++)
        {
            $address = $_.EmailAddresses[$i]
    
            $host.UI.Write("Green", $host.UI.RawUI.BackGroundColor, $address.AddressString.ToString()+"`t")
        
        if ($address.IsPrimaryAddress)
        { 
        $host.UI.Write("Blue", $host.UI.RawUI.BackGroundColor, "Primary Email Address`n")
        }
        else
        {
        $host.UI.Write("Red", $host.UI.RawUI.BackGroundColor, "Alias`n")
        }
        }
        }
        }
    }
    Read-Host -Prompt 'Press Enter to Continue'
}
until ($selection -eq 'q')