Is it safe?
No matter the OS platform you selected, a good Anti-Virus scanner is necessary when you connect to the Internet. This especially applies when you exchange information with attachments. Always keep the virus scanner up-to-date. It’s good practice to, at least once a week, check for virus definition updates ! Check my ‘Best of Breed Software‘ page for freeware anti-virus scanners.
Do not participate in the computer virus histeria, rather consult a security guru or an expert. Beware of a hoax, many people like you to panic and to forward unproductive and alarming messages. Before you spread the news first find out the truth and check sites like Hoax-Slayer. Although much safer than a PC, also MACs need protection.
Finally, if you have gone through these recommendations, you can check if all is safe with GRC’s Shields Up.
Check this post about security incident reporting.