When you want to keep track of a project -- like who you communicated with, and what you talked about & decided -- but not all of your transactions on the project are email messages, you can use Outlook's Journal funtion to collect the info in one place. The Journal is an often-overlook feature of Outlook. It can create a timeline of transactions (phone calls, conversations, meetings, etc.) that can be linked to one of your contacts.
Did you know that your calendar in Outlook 2007 is customizable? Even though the default view might be Week, find out how you can make it Day or Month to suit your needs. And find out how to change it from a 7-day week view to a 5-day work-week view. You can also show more or less detail in your calendar. These and more custom settings are demonstrated in this 4½ minute video http://office.microsoft.com/en-us/outlook/HA102392311033.aspx.