It's a MUST update for:
- Exchange Hybrid Environments (for more see a recent Sumatra Blog post on hybrid directory structures), particularly when the alias and SAM account names are different.
- US customers -- it has the latest DST updates.
- Sumatra's European customers -- it fixes an error when the mailbox name contains an umlaut (Jörg, Hans-Günther, Köller, Müller, Dück and MANY more will be happy!)
Download Exchange CU6 for Exchange 2016 here.