Group autosearch entries in Outlook search history?

I am seeing some complex search queries in my search history suh as:

(((from:(eva.XXXXXX@XXXX.se) OR from:(Eva XXXXXX)) OR ((from:(david@davidslight.com) OR from:(David Slight)) AND (to:(eva.XXXXXXXXXX@XXXXXX.se) OR to:(Eva XXX))))) AND received<today

While I appreciate the lesson is search term formation, I certainly didn' type these -- is this related to some group functionality?