Poker Software

[cyberfish]

I am a pretty noob to online poker but I understand that it's important to keep track of your results in order to improve your game.
So most of you are using Poker Tracker but I heard about Poker Office too.
Has anyone experience with that tool?
Is it a valuable substitute for PT?
Are there other Software-tools which are a must to have?

Thanks in advance

[Wahoo91]

I use PT and StatKing. Both are extremely useful.