You can change the time increments shown in your Outlook calendar to allow for smaller more detailed calendar entries. This will work in Outlook 2003, Outlook 2007, and Outlook 2010.
You may have a need to minimize the Ribbon to see a bit more of the screen in a program. It is also possible that your Ribbon may dissapear and you do not know how to get it back. In Office 2010 there are two ways to minimize/maximize the Ribbon. In Office 2007 you will have to use a keyboard shortuct to perform this operation. Both of these options are demonstrated in this video tutorial.