Elsevier is migrating from the older (legacy) Mendeley Desktop and Cite-o-Matic to the new Mendeley Reference Manager and Mendeley Cite.
It is possible to use both versions and sync them together.
If you already have references in one of your libraries it would be helpful to watch the tutorial video below first to make sure you don't get conflicts.
Mendeley comes with a Microsoft Word plugin which allows you to insert citations and bibliographies in to your Word document without having to cut and paste or leave Word.
The plugin can be found under Tools in your Mendeley Desktop.
Mendeley also provides a Web Importer tool which allows you to import citations, and sometimes the full text article, directly from your browser in to your library.
To install the plugin from the Mendeley app click Tools >> Install Web Importer.