The Office 2007 Professional trial that is available for download from Microsoft is about 500MB, but in stores, Office 2007 comes in DVDs no CDs, so I assume it is more than 700MB.

The downloaded version is in fact a full download and all you need to do is purchase a product key and register it.

So what are the differences between the online version and the DVD version, how come its so small in size? Any missing features?