Microsoft first launched the Office Insider Program for Windows back in late 2015, followed by the release of builds to Android , Mac and Windows 10 Mobile in the first half of 2016. This meant that almost all users could be an Office Insider, except for those on iOS. Today marks a change as Microsoft is now offering those on iOS a chance to become an Office Insider.
Currently, only the Fast Ring is available for those using iPhone or iPad, which means a faster pace of release of preview builds, but also more chances there will bugs and issues. Because of this, Microsoft is also advising users that there will be the risk of running unsupported builds on their devices.
