Offline mode enables you to use many of the core features of an application, even when you don't have access to the Internet. If you're working in Offline mode in Outlook 2013 or Office 365 and want to switch back to Online mode, you can do so via the Send/Receive group. Visit the Tips section if you're just looking for information on how to join a network on your Windows 8 computer.
Click the "Send/Receive" group to reveal the Work Offline button.
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Verify that the Work Offline button is blue. If it isn't, you are already online and any connectivity issues you are having are unrelated to Microsoft Outlook or Office 365. See the Tips section for advice on how to troubleshoot your Internet connection.
Click the "Work Offline" button to go online. You will know Outlook and Office 365 are in Online mode when the Work Offline button is white. The Working Offline icon will also disappear from the status bar at the bottom of your screen.
To join a network on your Windows 8 computer, swipe to the lower-right corner of your screen and click "Settings." Click the "Network" icon, click the network you want to join and then enter the password, if prompted.
If you switch Outlook to Online mode and still can't get the program to send or receive mail, the trouble likely lies with your Internet connection. Open a new Web browser tab and try to navigate to any website. If you can successfully do so, your Internet connection is working properly and you should troubleshoot your account settings in Outlook. To do this, click "File," select "Account Settings," and then select "Account Settings" again to open the Account Settings screen. Click your email account on the list of accounts and click "Change" to display its settings. Verify that your username, password, email address and server information are all entered correctly.
Although certain previous versions of the Chrome and Internet Explorer Web browsers had Offline modes, as of June 2014 only Mozilla Firefox retains this feature. To switch from working offline to working online in Firefox, click "File" on the main menu and select "Work Offline" to remove the check mark.