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Basically saying that those 2 are pointing to same site. I did it.
Now I noticed changes.
1. Site domain.com was automaticly added to mysites in google maps.
2. Crawl stats and Page analysis show "Data is not available at this time"
3. It looks like I lost ranking on some phrases in Google. Traffic fell considerably.
Question: That thing I used to connect domain.com to www.domain.com is not there anymore? Where can I disconnect?
Warning: If you already enjoying Google's traffic do not touch it.
2 days later the entire site went into supplimental and traffic dropped.
I too went back to remove it and the tool is gone as is the site.com
Site is 5+ years old, went from about 600 indexed pages to showing about 20, all in sup.
So far no problems on the site though - anyway traffic down since last data refresh, and I may get to see how bad it can get.
The non-www stuff will go supplemental and hang around for a year. That is normal and can be ignored. If the 301 redirect is in place, then it is not treated as being duplicate content any longer.