The Premium version of Outlook Web App provides an experience similar to using a desktop email client. The links below provide information about using the Premium web client:
Overview
Sending a message
Opening a message
Deleting a message
Replying and forwarding
Creating folders
Moving messages
Selecting multiple messages
About Conversation view
Switching on or off the Reading Pane
Setup automatic replies
Forwarding your mail
Email signatures
Switching to light mode
Searching your mailbox
Checking your quota
Add a domain to your safe senders list
Clutter