Re-use your passwords - Says Microsoft.

Not exactly, suggestion is to re-use for low risk sites;

Still, I don't agree fully.

(From the article)

Now Redmond researchers Dinei Florencio and Cormac Herley, together with Paul C. van Oorschot of Carleton University, Canada, have shot holes through the security dogma in a paper Password portfolios and the Finite-Effort User: Sustainably Managing Large Numbers of Accounts (PDF).

The trio argue that password reuse on low risk websites is necessary in order for users to be able to remember unique and high entropy codes chosen for important sites.

The link below has more information:-

http://www.darknet.org.uk/2014/07/microsoft-says-re-use-passwords-across-sites/