Last week was a big week for Exchange updates. Not only did we get Cumulative Update 8 for Exchange 2016, but we also got Cumulative Update 19 for Exchange 2013. Exchange 2010 also receives a critical security update in rollup 19.
As always, test these updates in a lab first! I recommend checking out this 7-part guide on configuring Exchange in your lab. It doesn’t take much to get one going.
The updates are as follows:
Critical security update for Exchange 2010
Rollup 19 for Exchange 2010 fixes a massive security issue for EWS connections proxied from an Exchange 2016 server. To quote Microsoft Support.
That is a significant security hole. For those on Exchange 2010 I highly recommend testing and upgrading to this rollup as soon as possible.