Classic ASP
Office365 IMAP with OAuth2 Authentication

Demonstrates how to authenticate using OAuth2 with outlook.office365.com.
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Classic ASP
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

'  An Office365 OAuth2 access token must first be obtained prior
'  to running this code.

'  Getting the OAuth2 access token for the 1st time requires the O365 account owner's 
'  interactive authorizaition via a web browser.  Afterwards, the access token
'  can be repeatedly refreshed automatically.

'  See the following examples for getting and refreshing an OAuth2 access token

'  Get Office365 SMTP/IMAP/POP3 OAuth2 Access Token
'  Refresh Office365 SMTP/IMAP/POP3 OAuth2 Access Token

'  First get our previously obtained OAuth2 access token.
set jsonToken = Server.CreateObject("Chilkat.JsonObject")
success = jsonToken.LoadFile("qa_data/tokens/office365.json")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to open the office365 OAuth JSON file.") & "</pre>"
    Response.End
End If

set imap = Server.CreateObject("Chilkat.Imap")

imap.Ssl = 1
imap.Port = 993

'  Connect to the Office365 IMAP server.
success = imap.Connect("outlook.office365.com")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
    Response.End
End If

'  Use OAuth2 authentication.
imap.AuthMethod = "XOAUTH2"

'  Login using our username (i.e. email address) and the access token for the password.
success = imap.Login("OFFICE365_EMAIL_ADDRESS",jsonToken.StringOf("access_token"))
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "O365 OAuth authentication is successful.") & "</pre>"

'  Do something...
success = imap.SelectMailbox("Inbox")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
    Response.End
End If

'  Your application can continue to do other things in the IMAP session....

'  When finished, logout and close the connection.
success = imap.Logout()
success = imap.Disconnect()

Response.Write "<pre>" & Server.HTMLEncode( "Finished.") & "</pre>"

%>
</body>
</html>