Cross button on the right-hand top corner of every file or document indicates to close the file, the same function applies to Microsoft Outlook also, when clicking the close button in Outlook window, Outlook is completely closed.
That means you will not get any kind of incoming email notification, and it will be treated as offline.
For keeping the flow of your emails, run outlook in the background even if you close outlook.
How to keep outlook active?
In this article, you will learn, how to keep outlook running, even if outlook minimizes to tray. Is it possible?
Yes, it is.
Go to the notification of your computer find the MS outlook logo, click the right button of your mouse and check Hide When Minimized, which will allow outlook to active even if you close your outlook.
How to Restore Outlook After It Has Been Minimized to the System Tray?
Just after clicking it your computer reflects with the message. “You have selected Hide when minimized, When the outlook window is minimized, you can restore it by clicking on this icon“.
To get back the previous position open outlook click the right button and again uncheck Hide When Minimized.