For a number of technical and operational reasons, we’ve decided to finally end our support for migrating legacy accounts and blogs after December 5, 2011.
If you are one of the blog owners who needs to read this, you will need to know the name and password for your (Legacy) Blogger account.
You will need to execute the Claim your blog wizard, before December 5. The normal Blogger account recovery wizard may work for you now - but after the end of next month, it will probably not.
If necessary, move ahead, this month. Next month will be too late.