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Imagine you have a large site on an aged and authoritative domain. For commercial reasons the site has to be moved to a new domain, and in the process is going to be revamped significantly. Not an ideal starting scenario obviously to be biting off so much all at once, but unavoidable. The plan is to run the new site in beta for about 4 weeks, giving users the opportunity to play with it and provide feedback. After that there will be a hard cut over with all URLs permanently redirected to the new domain. The hard cut over is necessary due to business continuity reasons, and real complexity in trying to maintain complex UI and client reporting over multiple domains. Of course we'll endeavour to mitigate the impact of the change by telling G about the change in WMC and ensuring we monitor crawl errors etc etc. My question is whether we should allow the new site to be indexed during the beta period? My gut feeling is yes for the following reasons: It's only 4 weeks and until such time as we start redirecting the old site the new domain won't have much whuffie so there's next to no chance the site will ranking for anything much. Give Googlebot a headstart on indexing a lot of URLs so they won't all be new when we cut over the redirects Is that sound reasoning? Is the duplication during that 4 week beta period likely to have some negative impact that I am underestimating?