Undo issue

[eMEf]

Hi all, I have a problem with undo function in MS PowerPoint 2010 which takes back too many changes then I would expect.

Here is the example

1. Open new presentation
2. Add new slide (so you have title slide and another empty slide)
3. Add the title on slide #1 (title slide)
4. Add subtitle on slide #1 (title slide)
5. Type some text on slide #2
6. Use undo function

What happen is that MS PowerPoint 2010 takes back all the text on both slides I have just typed.

Assume you are writing long presentation and on the last slide when you are almost done you will use undo function. You think that it will take back just the text you have typed on the last slide and you won't notice that it actually erased all the text in your presentation. You then type or do any change to the presentation and all is gone with no way back... Sad story which happened to me

Is it normal behavior?
Is it the same on 2007?

Thanks ahead for you replies

Michal