Autopmatically Subscribe Users to Email

Hello,

I’m running a wordpress blog for my company, it’s password protected, only for company use. The staff registers, I confirm them, then they’re allowed to create posts and comments. However, when we decided to switch from .com to .org, I didn’t think about subscriptions. Is there a way/plug-in to manually (i’m the admin) subscribe users to email updates concerning posts/comments without the users having to physically subscribe? There’s no legal/spam issues involved, the only users are my fellow employees. I’m pretty experienced with wordpress.com, relatively new to .org. Any help or advice would be greatly appreciated. Thanks,

Chris