I'm using the Outlook REST API v2 with url https://outlook.office.com/api/v2.0/me/. I was not able to add a big file attachment (20MB) to a message. Then i found this question here: Can not send large message with Office 365 REST API and as suggested there i tried using outlook.office365.com and my post request was successful.
So my question here is: what is actually the difference between outlook.office365 and outlook.office ? Are they exposing different APIs or are there some restrictions to one or the other.
The APIs exposed are the same. As Venkat noted in the other issue, there's just a lower file size limit on outlook.office.com.