Context: In 2011 a new, improved version of the Wayback Machine, with an updated interface and fresher index of archived content, was made available for public testing.

Question: When was an upgrade of the Wayback Machine released for testing?
Answer: 2011

Question: When was an upgrade of the game released for testing?
Answer: Unanswerable

Question: What did the Wayback Machine keep the same?
Answer: Unanswerable

Question: What was closed for testing?
Answer: Unanswerable

Question: What used the same index of archived content?
Answer: Unanswerable

Question: When was the Wayback Machine retired?
Answer: Unanswerable