New
#1
Insider level Version Current Build Release Date Insider
(formerly Insider Fast)1804 9229.2006 April 5, 2018
Version Release date Highlights Version 1804 (Build 9229.2006) April 5, 2018 Various performance and stability fixes
Source: Update history for Office Insider for Windows desktop - Office Support
See also: Insider release notes for Outlook 2016 for Windows desktop - Office Support