I know an organization that switched to Office365 some time ago—
from Google Entreprise / G suite:
Some people do use Google tools on the side, using personal accounts for collaborating on documents (presentations, docs). They don’t necessarily know the organization was using them before, it’s like they’re bringing them inside as a new tool.
Many exchange many MS Office words via e-mail (using desktop email clients).
People use WeTransfer for sharing files internally or with contractors.
People used to use Google Drive for sharing static files and it seems that this shared drive usage stopped and that people are not using OneDrive, relying on email and wetransfer.
(I would not be surprised if some team Slack exist somewhere or I’m pretty sure many use their Facebook messengers to send quick links and references)
As far as I know, the only consistently used Office365 tools are Mail and Calendar.
Office365 doesn’t seem to induce the same collaborative patterns that Google Drive induce at all.
Mostly it feels communication and collaboration are like 10 years or more ago:
email is king, versioning is absent, and people use external tools when they feel it’s quicker and better (at odd with the organization policies of course)
PS: I’ll add that all of my students are used to Google Drive tools, using Docs and Presentations regularly. It grew progressively over the year, and now it’s very rare to encounter a student who never used Google Drive.
I teach to 150+ students each year, so I’d say it’s representative of a new wave of professionals who take real-time collaborative tools for granted (and will be sorely disappointed by tools and process in the organizations they’re about to join)