Beginning on 12 September 2019 and continuing through September 16, users of Gmail and Microsoft Outlook began seeing notifications and errors stating “Server Rejected Login” and “Cannot synchronize subscribed folders” and “Cannot connect to the server” when sending and receiving. This happens even if the password has not changed and no changes have been made in Outlook.
The solutions on this page assume some basic familiarity with Outlook and Gmail. If you need detailed steps, please post a comment below and they will be added to this page.
Usually when there are Gmail issues in Outlook, it’s possible to remove the Gmail account and add it again. However, you’ll notice that you can’t remove the Gmail account if it’s the only account. You’ll need to add a second account, or setup an Outlook PST file to have something configured in Outlook in order to remove the Gmail account. Some people may notice issues every 4-6 months with Gmail and Outlook. Removing and adding the account again should help. However, this recent problem that people are experiencing isn’t resolved by removing and installing the Gmail account.
A solution, although somewhat unsatisfactory, is to setup Gmail using IMAP settings. You’ll probably need to go to your Google Account security settings and choose to allow less secure apps. This is normally off. Also, you’ll need to go into Gmail Settings and enable IMAP. Then you can setup Outlook using the Gmail IMAP manual configuration. For more about IMAP with Gmail, read “Use IMAP to check Gmail on other email clients.”
To learn more, read “Fix problems connecting your Google account to the Microsoft Cloud.”