@delta In some way its for the better, I have full control over who I chat with. It reminds me of the gold old Windows Live Messenger where you need your friend Windows Live ID in order to send him a request.
for the ones curious about what 8% of disk usage means here: it is a bit less than 40GB for the whole system, but the users mailboxes only take 17GBthat means: 17GB divided by 10k users equals 0.0017GB (~1.7MB) average used per user! 🤯