Here’s a handy little feature that has just been added to Office 365.
Let’s say that someone send you an attachment as shown above. if you now click on that attachment Office 365 will automatically show you that document side by side (provided of course it can be viewed in Office Online).
You’ll see the document on the left in Office Online and the email on the right. You can still download it to your desktop if you want.
At the top of the page you’ll also see the option to Edit a copy.
When you do it will create a new reply email on the right, take a copy of the attached document on the left and then place that copy into edit mode with Office online.
Once you have finished editing and adding anything you want to reply email, just press Send away it will go to the recipient.