The MCC came out in November 2014. It was ported to PC in November 2019. It is now March 2021, and the MCC still has some major multiplayer problems.

Is Halo Reach still online 2021 PC?

The Halo multiplayer servers are reported to shut down during December of 2021. As Windows Central notes, he online multiplayers Halo:Reach, Halo 3, Halo 4 as well as the Combat Evolved Anniversary might soon be unavailable on the Xbox 360 Master Chief Collection.