Mouse hover is more like mouse hibernation now. You have to wait until the Winter is over for it to hot track the items.
-MilesAhead
This might have to do with your machine specs and internet connection. Mouse hover is instant for me (I'm on a 13MB/sec broadband connection with a core i5 8GB RAM chromebook).
-dr_andus
Mostly it seems to be Firefox newer than 42.0.
-MilesAhead
I see what you meant now. I have just experienced the same problem in Chrome and IE on a powerful Win7 machine. It seems like Outlook is waiting for some stuff to download before it can display the mouse hover.
I think it's a Windows (OS) problem rather than a Firefox or machine specs problem, as on a lighter OS such as Chrome OS (Chromebook) all this is instant. Maybe Outlook.com is just too resource-intensive for older OS's.
This is a bit ironic though as Outlook is an MS product and so it should have the best performance on its own OS. I don't have time to test it now but I presume maybe it's faster in Edge on Win10?