B-Tree Structure Invalid Inbox Sort By Size

One of our users is receiving the following message when trying to sort his Inbox by size.

“B-Tree Structure is Invalid”

I witnessed this myself and could not find a resolution here on the forums. Would any of the utilities resolve this? TIA

Subject: as usual

load compact -d that will discard any built view indexes

if it doesn’t help, try compac -c

Subject: it worked, thank you