I love conversation view, most of the time. It makes it easier for me to follow message threads as all previous messages in the thread are together, regardless of which folder each message is stored in. Not everyone likes it and finding where to disable it isn't necessarily intuitive.
Conversation view (IMHO) is a most annoying & confusing feature. Please share with us on how to disable it in Outlook.com.
If you are using the new Outlook.com or an Outlook on the web in your business account, you can control how the message list sorts, set some predefined filters, and turn conversation groups off and on by clicking on Filter at the top of the message list to expand the menu. Select Show as > Messages at the bottom of the menu to turn off Conversations. Select Conversations if you want to group by Conversations. Note, Conversations is not a toggle, you need to select Messages.
If you want to change the reading pane position (or turn it off), preview text, change the order of the subject and sender's name in the message list, or change how the conversations sort (newest or oldest on top), click on the Gear icon then Display Settings.