Rufous Doors,

When you select your inbox, right-click your sort by ribbon. This will be the ribbon displaying the Subject, Size, and From fields. Right-clicking this section should have the option to sort by "To". Each received message will show in the list organized by to whom it was sent to.

Another option would be to create rules redirecting each incoming messages to a specific folder. Each inbound message can be set up using an alert or indicator on the folder.

Hope this Helps,