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Although in testing for some time, it looks like Google has started to roll out its Powerpoint competitor through a "View as Slideshow" feature in Gmail. When you receive an email with a Powerpoint attached, you can view the slideshow in a new window - no need to download and open in Powerpoint itself.
This is similar to the options Gmail provides for opening Word and Excel files in Google Docs and Spreadsheets, and gives me a reason to never use Microsoft Office again.
Related: GMail Attachments Double to 20MB
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