https://meta.discourse.org/t/massive-traffic-drop-from-google-searches-after-migrating-from-mybb/70969/4?tl=en
Massive traffic drop from Google searches after migrating from myBB - #4 by smaffulli - Support -...
Sep 28, 2017 - Almost 3 weeks ago we migrated an old forum from myBB to Discourse, bringing all the content and creating proper 301 redirects for all old threads, categories...