The Eclipse 3.6 (Helios) release added a new, easier way to install the m2eclipse plugin. If you want to start using m2eclipse, download Eclipse 3.6 (Helios), and use the Eclipse Marketplace. To open the Eclipse Marketplace, go to the Eclipse Help menu and select Eclipse Marketplace...
The first time you open the Eclipse Marketplace, you will be asked to select a Marketplace. Select the Eclipse Marketplace and click Next. Maven Integration for Eclipse is separated into two components: the Core of Maven Integration for Eclipse and an optional package of extra, unsupported components. To install the core component of Maven Integration for Eclipse, open the Eclipse Marketplace, select the Search tab, and search for "Maven Integration" as shown in the following figure. Click on the Install button to the right of "Maven Integration for Eclipse".
Eclipse will then ask you to agree to the licenses for Maven Integration for Eclipse in the Review Licenses step shown in the following figure. Maven Integration for Eclipse is distributed under the Eclipse Public License version 1.0. If you agree with the conditions of this license, select "I accept the terms of the license agreement" and click on the Finish button.