Question about installing Office 07

Hey guys what's up? Within the next few days I am gonna install Microsoft Office 2007. I haven't purchased it yet. My question is; how do I install Office 2007 if this netbook has no cdrom drive? Do I HAVE to purchase an external drive? As of right now, only the trial version is installed. Any help will be greatly appreciated! Thanks in advance! Oops, the product name is incorrect. It should read Toshiba mini NB200.

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