# Outlook no longer accepts classic authentication methods to sync **URL:** \ **Category:** Mutual Help\ **Tags:** desktop, android\ **Created:** [October 4, 2024, 2:18am UTC](https://forum.delta.chat/t/outlook-no-longer-accepts-classic-authentication-methods-to-sync/3281 "2024-10-04T02:18:40Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![link2xt](https://forum.delta.chat/user_avatar/forum.delta.chat/link2xt/32/1971_2.png) [@link2xt](https://forum.delta.chat/u/link2xt)\ **Post date:** [October 23, 2024, 1:08am UTC](https://forum.delta.chat/t/outlook-no-longer-accepts-classic-authentication-methods-to-sync/3281/2 "2024-10-23T01:08:56Z")
There is a related previous discussion at [Office/Outlook 365 will no longer support Basic Auth by Oct 1st, 2022 · Issue #3196 · deltachat/deltachat-core-rust · GitHub](https://github.com/deltachat/deltachat-core-rust/issues/3196) Delta Chat will likely drop XOAUTH2 support completely in the future. Gmail is pushing applications to use Gmail API instead of IMAP: [OAuth 2.0 Mechanism  |  Gmail  |  Google for Developers](https://developers.google.com/gmail/imap/xoauth2-protocol) The other provider Delta Chat supports OAuth 2 for is Yandex, but it is not usable because it asks users to open the browser and solve captcha when they hit some rate limits. Problem with OAuth 2 is that it requires pre-registering Delta Chat with each email provider and hardcording OAuth 2 authentication URLs into the application. This option is limited to large providers and they can always decide to change requirements and unregister the client. There are two approaches that try to fix OAuth 2: - mAuth: [mAuth - OAuth2 profile for mail apps and other public clients](https://benbucksch.github.io/mauth-spec/draft-mauth.html), [GitHub - benbucksch/mauth-spec: oAuth2 nailed down for email clients](https://github.com/benbucksch/mauth-spec) - GNAP: [https://oauth.xyz/](https://oauth.xyz/), [RFC 9635: Grant Negotiation and Authorization Protocol (GNAP)](https://www.rfc-editor.org/rfc/rfc9635) --- _[View the full topic](https://forum.delta.chat/t/outlook-no-longer-accepts-classic-authentication-methods-to-sync/3281)._