A WebmasterWorld thread has one person claiming he received a PageRank 7 link from the almighty Apple.com web site. After about a week, his ranking has not moved. He asked:

I’m not seeing anything measurable from Goog. How long might it take to even see a 10% boost?

The person did say he has a nice traffic boost from the link, but no ranking boost. Why not?

Could be a bunch of reasons:

(1) Google didn’t pick up the link yet.
(2) The link is nofollowed or blocked from passing link juice some how
(3) Google manually doesn’t count links from specific sections of a site
(4) Just needs more time

Tedster added:

I don’t think anyone would turn down a link from Apple, with or without it passing any link juice. So he should be happy either way.

Forum discussion at WebmasterWorld.