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Second suggestion would be to use the canonical tag for a month or two and then do a 301, but keep the original domain name for as long as possible to maintain those 301s.
joined:June 3, 2007
The company that manufactures the widgets has just decided that they no longer want retailers to use parts of their company name in their domain name.
If so, simply move the site to its new home as it is now, url for url, and you should retain all backlinks etc.
they no longer want retailers to use parts of their company name in their domain name.