Référencement Google : Redirection 301 et perte de PageRank
Annonce importante dans le monde du référencement Google : une redirection permanente (301) ne passe pas la totalité du PageRank de la page source à la page cible. C’est dans une interview de Matt Cutts par Eric Enge que le sujet est abordé. La réponse est d’ailleurs des moins certaines.
Eric Enge: Let’s say you move from one domain to another and you write yourself a nice little statement that basically instructs the search engine and, any user agent on how to remap from one domain to the other. In a scenario like this, is there some loss in PageRank that can take place simply because the user who originally implemented a link to the site didn’t link to it on the new domain?
Matt Cutts: That’s a good question, and I am not 100 percent sure about the answer. I can certainly see how there could be some loss of PageRank. I am not 100 percent sure whether the crawling and indexing team has implemented that sort of natural PageRank decay, so I will have to go and check on that specific case.
Mais Matt Cutts confirmera ultérieurement l’information par mail :
Note: in a follow on email, Matt confirmed that this is in fact the case. There is some loss of PR through a 301.
Si vous aviez pu remarquer ledit comportement, le voilà officiellement confirmé.
Source : Stone Temple
16/03/2010 à 13:13 
Je l’avais effectivement remarqué lors de mon changement d’adresse.