Usernames and passwords for more than 100 e-mail accounts at embassies and governments worldwide have been posted online. Using the information, anyone can access the accounts that have been compromised.
I am not sure how much needs to be said about this. In general email security is very lax. People often forget just how much information lives in their email accounts. Especially when using Exchange or IMAP type email, all of your old email archives will be compromised if your account is breached. When you consider all of the file attachments most of us get every day, there is probably little sensitive information any of us handle that is not contained in those email archives.