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If someone has emailed you, in Gmail, a PowerPoint and you want to be collaborative, you can open the PowerPoint right in Google Drive. No office software required.

Find the Attachment

The attachment will be at the bottom of your Gmail. You will recognize the file format at PowerPoint by the orange P in the bottom left of the icon.
PPT attachment

Hover

Hover over the attachment to notice different options. You can download the PowerPoint by clicking on the down arrow. You can alternatively save the PowerPoint as a PowerPoint into your Google Drive by clicking on the drive icon.
Hover over the attachment

Click on the Attachment

Clicking on the attachment, not the icons, opens the PowerPoint in preview mode. You can scroll through the slides without launching the PowerPoint in Office or in Google Drive.

Notice down in the bottom right is a blue button to “Open With.” Choose to open with “Google Slides.” This will create a copy of the PowerPoint and convert it to Google Slides presentation. This is now able to be edited and shared.
Add to Google Slides

Conversion

Is the conversion perfect? No, but overall it is pretty darn good. I have found I need to edit a few slides to make sure the text boxes are the right size. Frequently I just leave it the way it converts it, the conversion is fairly decent.