Well as of today April 12, 2010 this is the latest news that's up on the RapidShare news page.
So if you have got such mails kindly ignore them and be safe.
Phishing attack on RapidShare customers
Unknown persons are currently sending thousands of e-mails which ask the recipients to update their RapidShare accounts' billing information.The sender address of those e-mails is fake. The messages do not come from RapidShare, and the link contained in the message leads to a fake website. Please do not enter your account data on that page. If you already did, or if you have any questions regarding this topic, please contact our customer support.
So if you have got such mails kindly ignore them and be safe.