In the Folder pane, right-click your account name, and then choose Remove. If you open Outlook using the new profile and it’s still disconnected, try removing your account and then adding it back again. To eliminate the possibility that there's a fault in your current Outlook profile, create a new profile. Read the check for updates topic and install any required updates. If the status shows Working Offline, repeat the action until the status changes to connected.

On the Send/Receive tab, choose Work Offline, and check your status bar.

Here are some suggested ways to reconnect to Outlook. But your computer might need updates or there might be a problem with your account settings. If you can send and receive mail on the website, then your mail server is fine. If email isn’t working on the website, call your technical support for your email service provider for help. If you can log onto your email from a website-for example, -check to see whether you can receive and send email that way. If your Internet connection is working, there might be a problem with the mail server. What follows are just a few examples of some of the possible reasons. There can be different reasons why you're disconnected from Outlook. We recommend always turning on Cached Exchange Mode with a Microsoft 365 account. Or contact the person who manages the Exchange server for your organization. Follow the steps in Turn on Cached Exchange Mode to change that setting. If you don’t see the Work Offline button and your email account is a Microsoft Exchange Server account or a Microsoft 365 account, Cached Exchange Mode might be turned off. But if the background is clear, you are connected. If the background of the Work Offline button is shaded (as shown in the image above), you're not connected.

Outlook 365 working offline stuck