He did not exonerate Trump.......as Mueller himself said. His report contained multiple examples, complete with granular detail, of Trump's obstruction of justice.
WASHINGTON (AP) — Special counsel Robert Mueller said Wednesday that charging President Donald Trump with a crime was "not an option" because of federal rules, but he used his first public remarks on the Russia investigation to emphasize that he did not exonerate the president.
apnews.com
The section entitled “Hack and Leak” contains perhaps the frankest statements describing efforts by the Trump campaign institutionally—and Trump personally—to take advantage of Russia’s efforts, through WikiLeaks, to damage Hillary Clinton’s candidacy:
The report summarizes the key role of Roger Stone in these efforts:
Our summary of the Senate Intelligence Committee’s final report on Russian interference in the 2016 election.
www.lawfareblog.com