How to fix Outlook stuck in offline mode?

As we are well aware that Microsoft Outlook is a very helpful application that allows us to send and receive emails instantly. However, at times, it may start to give you a tough time by showing offline whenever you try to use it for the emailing purpose. This not only frustrates the user but also makes him think about what should be his next move to get rid of this issue. Most of the time, this issue can be easily fixed by upgrading your application via office.com/setup. But, sometimes, this is not enough and you have to fix it using other troubleshooting ways.