Here's one that one of the staff received this morning...

-------- Original Message --------
Subject: 	Account deactivation
Date: 	Mon, 2 Apr 2012 08:56:23 -0400
From: 	Maciejowski, Jay<[log in to unmask]>
To: 	undisclosed-recipients:;

Microsoft Inc. has been receiving complaints from our Customers for
unauthorized use of the OWA Accounts. As a result we periodically review
Microsoft Outlook Webmail Access Accounts and temporarily restrict
access of those accounts which are vulnerable to the unauthorized use.

This message has been sent to you from Microsoft Technical Department
because we have noticed some invalid login attempts into your Account
and due to this development, we are temporarily restricting your Account
Access until we confirm your identity. To confirm your identity and
remove your limitations please click here
to fill out the request form and submit.

Microsoft Inc. is committed to ensuring the confidentiality of each
customer's personal information, making sure only authorized individuals
have access to their Accounts. It is all about your security as outlined
in our Agreement and Microsoft will periodically update you on site
changes and enhancements.