The rate of growth is impressive, with more than one million people using join.me for the first time each week, company officials claimed.
"In 2012, join.me has become LogMeIn's fastest growing product, both in terms of new users and new sales, and we believe it's now among the fastest growing collaboration products on the market," said Lou Orfanos, LogMeIn's director of collaboration products.
"As join.me grows to serve millions of users and their broadening needs, we will continue to invest in delivering powerful features while maintaining a simple yet elegant experience, a core philosophy we believe will continue to drive rapid, viral user adoption."
Screen sharing is a core component of the free service, but window sharing has the advantage of keeping focus on the intended content and avoiding interruptions caused by other applications that happen to be running on the presenter's computer.
Other features of the pro version (which costs $US19 per month or $US149 per year) include premium audio conferencing lines, presenter swapping options, private meeting rooms, custom meeting links, and administrative control for teams.
Also relatively new is the free join.me app for Windows 8 PCs, phones and tablets (illustrated above).
The app takes advantage of the 'UI formerly known as Metro' but now officially named 'Windows 8 UI' and works with the free and pro version so join.me.