Fix message synchronisation
Both windows and Android client is almost always out of sync! Especially android client.. Try to sync manually and it says it couldn't do it right now, so you have to exit the app and go back in, then it will sync. Also messages read on web or other client shows up as unread on mobile, and the other way around. Just make syncronisation of messages work!
This is incredibly frustrating. It is a daily occurrence for me and I basically can never expect my messages to be in sync.