Quick Parts in Office Online
I send the same email multiple times a day, every day. Using Quick Parts in the desktop app saved me so much time and ensured I did not miss any information. I have about 15 of them for recurring emails in my desktop version. Not having Quick Parts in the Online 365 version is not efficient and will be very time consuming. Please please add this feature to Office 365 online!!!
Try using "My Templates" in Outlook online. Might be a good workaround.
I agree with Alyssa: the Outlook Web App mail feature should definitely have Quick Parts integrated in it. It would compensate for not having 'Templates' available.
Reacting to what Dustin Hall wrote: Quick parts are quickly available after you opened them once in a new mail message. Typing the name of the Quick part will suggest the quick part automatically, than you can click on it.
Dustin Hall commented
The Quick Parts menu should be accessible from the main email "Message" page rather than making you have to dig for it. It defeats the purpose of it being quick.