Working offline
The working online/offline feature was added to Outlook in the 2010 version and has remained in all later versions. The purpose of this button is to allow users to be able to access their work on Outlook without internet connectivity. In offline mode, you are still able to access loaded emails and compose new emails; however, you can’t send or receive new emails. If you send in offline mode, your emails will be scheduled to be sent as soon as an internet connection is available and when you have regained online features.
Is Outlook working?
There are two ways to identify whether Outlook is working or connected to the internet:
The display settings on the status bar will indicate that you are connected to the Exchange server on the status bar.
If the internet is down, you will see an indication that you are working in offline mode.