- Log into LinkedIn.
- Click "My Profile" tab.
- Click orange area which says "Recently updated your profile? Let your network know...".
- Follow the instructions on the "Send Your Updated Profile" page. Note that you can add email addresses for people to whom you are not directly connected.
Personally, I have never felt comfortable with the idea of sending a mass mailing, be it a LinkedIn profile update or a Christmas card with a newsletter of what I did over the past year. I have always preferred person to person communication.
But I must admit I have used this LinkedIn feature once recently to announce that I had totally overhauled my LinkedIn profile, and to relay news about a lot changes in my life within in a few months period (promotion, graduated with an MBA, became a board member for a non-profit, etc.). I thought if I talked to each person individually about all of these major changes, it would be months before I got to tell some people, and those who I told later might be disappointed that I didn't tell them about all of these changes earlier. So I made an exception and sent my first mass email. I advise that you too only use this feature in exceptional cases. Otherwise, you might find your direct connection count decreasing as your direct connections sever their connection with you.