Who is using or investigating Google Workspace? What is your experience regarding collaboration with Microsoft 365 users in the own organization or with other companies ? Which Microsoft services are still in use? Do you also consider Google Chrome Enterprise Premium? Do you have a plan to fully migrate to Google (and what's the timeline)?

We use Google Workspace for over 5 years now (cca 30k licenses). Still have some Office licenses due to the external sharing and for finance team as John mentioned in his comment. 

We also do use Chrome Ent. 

We still have AD that we are considering now to kick off the project of analyzing and starting a process of removal of AD from our infrastructure. 

Process of migration was year and a half long, adoption to GWS is much easier with younger employees (they have more personal experience in using google tools), compared to the experienced ones who already know their productivity tricks with Office. 

We've been a long time user of Google Workspace. We've also had to maintain a parallel set of Microsoft licenses (Office suite only - Word, Excel Powerpoint etc) for a portion of the organization. We will never be able to get to Google only - we have requirements for external content sharing/collaboration requirements (e.g. legal, procurement), application specific support for MS Office only, or at times simply user preference. We periodically have to harvest Microsoft licensing to avoid too much overlap. It imposes an approval process - who also gets Office. The use of both tools creates some inconvenience when moving between file formats both within the organization as well as externally sharing - they're pretty compatible but there are always formatting and other minor issues. We will not consider chrome enterprise premium. If we were migrating anywhere, it would be to standardize on Microsoft, though it's not high on the priority list at the moment.