It's a G Suite integration, which means that the same panel is available in Gmail, Calendar and Drive (and eventually in Docs, Sheets etc.). But the functionality is not the same everywhere and depends on the context. Right now, in Gmail , you can:
Access your Workfront Home, see your assignments
See the details and custom forms of your work items
Update status and percent complete of your work items
See the updates stream, post updates and reply to comments
See the attached documents
Convert your emails to tasks or issues in Workfront (contextual)
Post your emails as new updates to Workfront (contextual)
Reply to WF comment notification emails right form your inbox (contextual)
Make approval decisions when you receive a new WF approval request email (contextual)
See additional details in Workfront whenever you open a WF notification email (contextual).
As you see, 1-5 are context agnostic - they just give you access to your tasks in Workfront and let you work with them - mark done, post comments, check the info in custom forms etc. This functionality is shared across all apps in G Suite, so you'll see the same in Calendar, Drive etc. Now, 6-10 are contextual actions and need an email to be opened. Naturally, these will work only in Gmail. Our integration does not support any contextual actions for Calendar and the rest of G Suite apps, at least for now. But we're on it: for example, one of the future updates will enable you to convert your Calendar events to tasks in Workfront, or (in Docs) immediately attach the open doc to a Workfront item and ask someone to approve it. I hope this makes sense :) Let me know if you have any ideas or suggestions in mind. Hayk Falakyan