An area that Microsoft have massively improved upon is their documentation for the Office suite. Office Online and the online version of the help within the Office 2007 applications is very impressive these days.
Sometimes it feels like reinventing the wheel for us to produce some forms of documentation as Microsoft have already produced demos, training and how-to documents to a high standard. It is surprising that it is not first port of call for needing to know how to do something within Office, perhaps it is because the Paperclip man (Office Assistant) from old versions of Office was so annoying.
I would in particular recommend the Outlook documentation at Office Online here.