Mailboxes pulling mail from G Suite accounts are less-aggressively disabled when username and password are not accepted. If you’ve been seeing this lately, please take a look at Google’s troubleshooting tips, especially the Captcha step.
EWS Mailboxes: previously, you could only setup a mailbox that used your email address as the username for login, and used autodiscovery to setup the configuration. You can now enter a domain\user format username, and the server field can be used for either a URL or put your email address in it to use the old autodiscovery behavior.
Fixed: Attachments with bidirectional control characters in the file name were (unhelpfully) allowed to be uploaded, but not downloaded.