使用OAuth2认证结合EWS实现实时读取邮件功能

公司之前有一个进行邮件获取的功能，使用ExchangeService+TLS1.2认证的方式，但是由于微软将要将这种认证方式列为Legacy authentication，且将在2022年10月下载该认证方式。因此将尝试使用OAuth+EWS这种认证的方式。别问问啥必须用微软系的功能，问就是公司硬性要求。

如下为更改通知：

Stop legacy authentication:

Microsoft have announced that Exchange online – will stop allowing legacy authentication from October 2022

I am writing to you – because you are registered as owner of an account used for legacy authentication. (Legacy authentication is basically using username / password for authentication)

Reason

The reason why Microsoft  choose to remove support is Legacy authentication is that it considered insecure and added a risk to XXXXXXXXXXXX for password spray attacks.

Information

The spreadsheet included is also published here and general information on changes in the cloud: