The May 2015 Xbox One System Update is now available on Xbox One worldwide. The May 2015 update adds voice messages, power on/off from SmartGlass, user selectable power mode, dedicated servers for party chat and loads more. 

Check out the full list of features rolling out today in the May system update.

• Voice Messages – You can now send and receive voice messages from the Xbox One messages app. This is the No. 1 feature requested in the Friends and Parties area on the Xbox Feedback site > “Add audio message …”

• Power On/Off from Xbox One SmartGlass – The Xbox One SmartGlass app for Windows, Windows Phone, iOS and Android are being updated to let you power your Xbox One on and off when your devices are on the same home network as your console.

• User Selectable Power Mode – We are also altering the initial setup experience on Xbox One worldwide to enable you to select your preferred power mode between Instant-on or Energy-saving mode.

• Dedicated Servers for Party Chat – We will start to expand the availability of the party chat relay services beyond preview members to a broader audience as we continue to fine tune the feature and scale out the servers needed to support party chat relay services.

Larry Hryb, Xbox Live's Major Nelson, details the May Update for Xbox One, check out the video below!