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Set Default Columns 1.0 Requires Restart
Provides ability to set default visibility of columns in the thread pane.
About this Add-on
However, even if you want that the "Priority" column is shown for all folders, for all users, there is no way.
This addon provides a preference entry to customize the list of default visible columns of all folders.
For example, if you want the column "Priority" is visible by default, then you'll put a directive into your MCD configuration file, like:
...list of other default columns...
This is mainly designed for corporate-use.