With a Microsoft Exchange Server or Microsoft 365 account, you can work offline to avoid connection charges or stop Outlook from attempting to send and receive messages over a slow network connection. Newer versions Office 2007 Switch between working offline and working online Click Send / Receive > Work Offline . When Outlook switches between working online and offline, all email accounts are changed. You know you're working offline when Work Offline is highlighted on the ribbon or Working Offline appears o...