File > Export, and choose PNG.
You don't need Photoshop at all.
You can do as Scott suggested but you might actually find another Item in the fie menu will serve you best.
File>Save for Microsoft Office is set up to optimize the png for use in Office applications best.
So you should try both and see what you like.
Even Save for Device and Web offer you the choice to optimize the png, I would choose png 24.
You should try all three ways, there may no longer be a difference between any of these three options.
I find the "save for Microsoft Office" command, less than ideal in many cases. Whereas the export to PNG works in all cases.
thanks guys, both really helpful!
If the illustration is meant for printing, turn antialiasing OFF.
Yes I recall some users having this problem but I have never found
that to be so for me. That's why i suggested that a test would be the
ideal way to go.