(PowerShell) Office365 POP3 Login with OAuth2 Authentication

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Note: This example requires Chilkat v9.5.0.83 or greater.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$mailman = New-Object Chilkat.MailMan

$mailman.MailHost = "outlook.office365.com"
$mailman.MailPort = 995
$mailman.PopSsl = $true

# Use your O365 email address here.
$mailman.PopUsername = "OFFICE365_EMAIL_ADDRESS"

# When using OAuth2 authentication, leave the password empty.
$mailman.PopPassword = ""

# Load our previously obtained OAuth2 access token.
$jsonToken = New-Object Chilkat.JsonObject
$success = $jsonToken.LoadFile("qa_data/tokens/office365.json")
if ($success -eq $false) {
    $($jsonToken.LastErrorText)
    exit
}

$mailman.OAuth2AccessToken = $jsonToken.StringOf("access_token")

# Make the TLS connection to the outlook.office365.com POP3 server.
$success = $mailman.Pop3Connect()
if ($success -ne $true) {
    $($mailman.LastErrorText)
    exit
}

# Authenticate using XOAUTH2
$success = $mailman.Pop3Authenticate()
if ($success -ne $true) {
    $($mailman.LastErrorText)
    exit
}

# Find out how many emails are on the server..
$numEmails = $mailman.CheckMail()
if ($numEmails -lt 0) {
    $($mailman.LastErrorText)
    exit
}

# Examine the POP3 session log:
$($mailman.Pop3SessionLog)

# The POP3 session log will look something like this:

# **** Connected to outlook.office365.com:995
# < +OK The Microsoft Exchange POP3 service is ready. [QwBIADIAUABSADEAOABD...YwBvAG0A]
# > AUTH XOAUTH2
# < + 
# > <base64 string in XOAUTH2 format>
# < +OK User successfully authenticated.
# > STAT
# < +OK 3 375302

# End the POP3 session and close the connection to the GMail server.
$success = $mailman.Pop3EndSession()
if ($success -ne $true) {
    $($mailman.LastErrorText)
    exit
}

$("Finished.")