[rrdharan]

Well it becomes important when your .PST file is about to hit the 2GB limit and you need to find large attachments to delete.

https://www.lifewire.com/outlook-pst-files-size-limit-117334...

(NB: I’m being facetious, and agree with you - this, 15ish years ago, is really the last time I remember needing to sort by size)