Messages are sorted as follows:
Ascending order arranges the rows within the Message List alphabetically or in numerical sequence as follows:
Text fields are sorted alphabetically (A-Z).
Date fields are sorted with the oldest date first and the most recent date last.
Number fields are sorted with the smallest number first and the largest number last.
Descending order arranges the rows within the Message List as follows:
Text fields are sorted alphabetically (Z-A).
Date fields are sorted with the more recent date first and the oldest date last.
Number fields are sorted with the largest number first and the smallest number last.
NOTE: If the record contains nulls or blanks in the sort field, those records will be found at the bottom of the list.