Have you discovered the Search feature of Windows Mobile?  The search function searches for strings of alpha- numeric data across applications.  For instance I often forget when I had my last haircut.  When my hair starts bugging me, I'll look back in my calendar to see how long it's been.  This is easy to do:

• Tap Start > Programs > Search
• Input the search string into the "Search for" line
• Tap the down arrow to the right of the "Type" line and select Calendar
• Tap Search

Unless you specify otherwise, the search function searches across the Calendar, Contacts, Tasks, Notes, Outlook (email), Excel and Word applications. 

I ran a few tests and found that the search function

• Searches the file names only for Excel and Word files.  Search does not search data inside Excel and Word files.
• Searches the to and subject fields as well as the bodies of all messaging accounts
• Searches across all Outlook applications (calendar, contacts, tasks, messaging, and notes) when Outlook Mobile is selected

The Advanced option only seems to be active when Word Mobile is selected:

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