1) But your sentence has a different meaning. What happens if action is taken?
2) "note that" is more clunky, but it is also more polite. One of the largest problems with computers is that they are impersonal and unfriendly. Thus, I would error on the side of making the computer program more friendly so that more people like it and more people will buy it.
Continuing MountainHiker's concern about software messages not being helpful to users, I would like to add my 2 paise (I am from India...I have to be politically correct).
Suppose the print command triggered by your software fails. The error messages that are typically displayed (in 5 out of 10 softwares) are something as blunt as 'Unable to print.'