> Do note that during the pilot phase, the new system runs in parallel with Microsoft 365 rather than replacing it outright. That's okay, I think.
Well I think it's not ok without at least a fixed deadline for removal of MS365. People usually have work to do and learning new ways to get it done means extra work, and (almost) nobody takes upon extra work if they don't have to. So the new software will be largely ignored by default.