When a user selects the generic Welcome page and displays his/her ToDo list, the list defaults to a view that displays all ToDo items, including closed ones. This can leave the user with a lengthy list of completed items to scroll through before finding active items. So I changed my users' default ToDo view to filter out all completed items.
Here's how to do it:
Open the user's mail file and select the ($ToDo) view. Modify the view selection formula by appending the following text to the formula:
& (DueState !=9)
This will eliminate all the completed items from the view. This will also affect your "by Due Date" view in ToDo but since the other views display completed items, it was a small fix for a big benefit.