Rated 5 out of 5 stars

This does work with 3.1.2 but:

When I applied columns recursively downwards the first time it only went down 3 layers after which the columns were displayed with their default settings.

I tried this again later on and the columns were correctly applied down through all sub-folders.
Maybe it was my machine, or else a software "feature".

Also, if you delete the "*.msf" files the column information is removed.

gyc - Try clicking the icon in the right had display pane which has the column heading tooltip "Click to select columns to display"

Upgraded to 5****

This review is for a previous version of the add-on (1.1). 

Ian, are you sure you're looking at just the folder columns and not the message pane columns? This extension only does things for the folder columns - so I'm not sure what you're on about when you're talking about recursively going downwards.

The information is generated from the .msf files so if you delete those, column information may be removed until you re-open those folders.

Rated 5 out of 5 stars

Re: my previous review, I tried this again and the columns were correctly applied down through all sub-folders.
Maybe it was my machine, or else a software "feature".

Upgraded to 5****

This review is for a previous version of the add-on (1.1). 

Rated 3 out of 5 stars

This does work with 3.1.2 but:

When you apply columns reccursively downwards there looks to be a limit of 3 layers after which the columns are displayed with their default settings.

Also, if you delete the "*.msf" files the column information is removed.

gyc - Try clicking the icon in the right had display pane which has the column heading tooltip "Click to select columns to display"

This review is for a previous version of the add-on (1.1).