Take care: There is a new Ransomware for Windows: Fantom is based on the EDA2 ransomware project and can't be counteracted at the moment.
http://www.notebookcheck.net/Ransomware-Fantom-pretends-to-be-a-critical-Windows-update.172652.0.html
Out of necessity to cover our own needs and protect our clients we created an application called RansomSaver, it is an Outlook add-in and basically what it does is moves new incoming infected email to a folder under the deleted items called RansomSaver. We provide this software for free and with no strings attached.
To download or see further information regarding RansomSaver please visit http://synergy-usa-llc.com/ransomsaver-overview.html