The Light version of Outlook Web App provides an experience similar to using other webmail providers including SquirrelMail. The links below provide information about using the Light web client:
Overview
Sending a message
Opening a message
Deleting a message
Replying and forwarding
Creating folders
Moving messages
Selecting multiple messages
Setup automatic replies
Email signatures
Switching to premium mode
Searching your mailbox
Add a domain to your safe senders list