In the updated Endnote X7 you can
Since sharing relies on the Endnote sync services, you must first set up your EndNote web account and fully sync your library before you can share.
Once this is done, go to File > Share and enter the email addresses of the people you want to share with (up to 14 people total).
Sync times can vary depending on the size of your library. Be sure to check the Sync Status, located in the My Library panel, to make sure your library is fully synced before sharing.