You already have Office 365 connections for calendar and tasks. Round it out with OneDrive and OneDrive for Sites.
The ability to link in PDFs, detailed how-tos, or CMDB docs that need to be reused is valuable. Plus with a link to sites we can easily include links to information already published to a user (perhaps a policy document, or similar).
I agree. OneDrive integration would be helpful.
OneDrive for Business/Sharepoint Online would be ideal, but at least let us add URL as attachments at that would get us much closer be a reasonable workaround.