You may be wondering why your cursor keys along with your Home and End keys are not working properly. When you attempt to move your cursor from one cell to another using the cursor keys, the entire spreadsheet moves in that direction. Also the Home and End keys only take you to the far left or right of that row that is currently visible instead of taking you to the beginning or end of that row.
The simple solution might be that you accidently turned on your Scroll Lock. This is a special key that is seldom used today and exists near that upper right of the keyboard between two other keys rarely used, Print Screen/ System Request key and the Pause / Break key. Check your keyboard and see if the light for the Scroll Lock is on, if so that is likely the cause of your issue. Simply press the Scroll Lock key once to turn it off; you should notice the indicator light goes off as well.
With such a large number of connection issues with Outlook 2016 connecting to Office 365 you would think someone would have the definitive answer to these persistent issues. It is unfortunate that the issues that plague Outlook 2016 are not all related. Hopefully after you have read this technical note you too will be able to resolve your issue. Although this is not the fix that will fix all Outlook connectivity issues, but then again it might fix yours.
I guess starting with the obvious is always a good place to begin.
The reading pane in Microsoft Outlook is a took that allows the user to quickly view the contents of an email message. The down side to this is that it causes an open message process that can cause some e-mail borne viruses to activate as soon as they enter the Inbox. For security purposes we recommend that end users review the subject and who the message is from before opening the message to ensure they are not allowing something malicious to run on their computer. Closing the reading pane helps to ensure that the end user takes the time to check the message details first before opening it.
How to Turn Off Reading Pane