I finally found an App that actually reads and reports the contents of ~/Library/Application Support/App Store/updatejournal.plist
Etrecheck under the heading of Software Installs in the Last 30 Days. (Etrecheck notes the list may be incomplete???) Etrecheck's list (and updatejournal.plist) has a lot more entries than what appears in App Store's "Updates installed in the last 30 days" and does not include any System software updates. Neither Etrecheck nor App Store provide any means of accessing the extensive text and "version notes" type data shown in updatejournal.plist.
I can't figure out a rhyme or reason for updatejournal.plist or its contents. Is it a hangover from previous App Store iterations, a precursor of future App Store contents, or what? I am sorry you brought the subject up 'cause it has my
curiosity bump itching like crazy.
