Well, there is current disk quota reporting builtin to RoundCube. It displays along the bottom of the screen as:
"Disk usage: unknown" - if you do not have support
OR
"Disk usage: 42.27MB / 97.66MB (43%)" - if you do have support.
As for a bar that displays a visual indication of how full your inbox is, there was a post on the old forum about that. Someone had created code for a nice bar that would be across the bottom. It would be either Green, Yellow, or Red based on where you were in disk usage.
Anyone have that post anywhere?
Kevin L.