Welcome to aximsite, Ajay Rathod!
Are you talking about something to supplement (or supplant) the notes that come with pocket outlook? They sound fine for what you need, but if you want something more, phatnotes
http://www.paragraph.com/phatnotes/ seems to be the market leader (and they've just won a "best of category" in pocket pc magazine's "best software awards" for the fourth consecutive year). They have a 30 day trial period so you can see if you like the program before you pay for it (phatnotes is not cheap).