The Elder Scrolls Online Is Free to Play for an Entire Week, on All Platforms
Starting April 11 2017 you and your friends can play The Elder Scrolls Online: Tamriel Unlimited for free for a full week. You can download the game on your platform once the event starts but be noted that Xbox One players need Xbox Live Gold membership to play the game.
The event starts on April 11, 2017 at 10:00 am EDT on PlayStation 4, Xbox One, and Steam (PC/Mac) and ends on April 18, 2017, at 10:00 am EDT.
The free-to-play event allows you to play the full base game of The Elder Scrolls Online: Tamriel Unlimited except the DLC game pack areas. Free players will receive 500 crowns to spend in the in-game store.
Players who want to purchase the full game can expect a discount during the event period on Steam, PlayStation store, and Xbox store. All progression in the free-to-play period will be carried over to the full game.
Source: official site