Replying to iBook

so im thinking about getting a laptop for school next year and was told to take a serious look at ibooks.

ive only ever used a mac once for about a hour to edit a small video for class and i loved how easy the programs were to use.

but if i get a mac is it gonna be a bitch to get programs for and stuff like that?

for example if i start typing a essay in microsoft word will i be able to save it and start typing the rest of it with a mac?
or does one not work with the other?

its just small things like that im worried about, i want to get a mac for video and picture editing and such but i also would like to be able to use it for downloading songs, talk on msn, type up school work etc.

if anyone knows a little about them that would be great


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and if you dont know then you dont know.
bitch.