(.NET Core C#) Office365 IMAP with OAuth2 Authentication

See more Office365 Examples

Demonstrates how to authenticate using OAuth2 with outlook.office365.com.

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// 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.
Chilkat.JsonObject jsonToken = new Chilkat.JsonObject();
bool success = jsonToken.LoadFile("qa_data/tokens/office365.json");
if (success == false) {
    Debug.WriteLine("Failed to open the office365 OAuth JSON file.");
    return;
}

Chilkat.Imap imap = new Chilkat.Imap();

imap.Ssl = true;
imap.Port = 993;

// Connect to the Office365 IMAP server.
success = imap.Connect("outlook.office365.com");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// 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 != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

Debug.WriteLine("O365 OAuth authentication is successful.");

// Do something...
success = imap.SelectMailbox("Inbox");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// 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();

Debug.WriteLine("Finished.");