Insider level Version Current Build Release Date
Monthly Channel (Targeted)
(formerly Insider Slow)
1711 8730.2122 December 4, 2017

Version Build Release Date Description
1711 8730.2122 December 04, 2017 Contains fixes and improvements for Version 1711. For features, see What's new for Office Insiders.

Source: Update history for Office Insider for Windows desktop - Office Support