Exchange Team released: Cumulative Update 1 for Exchange Server 2016
Issues that the cumulative update fixes
KB 3139730 Edge Transport service crashes when you view the properties of a poison message in Exchange Server 2016
KB 3135689 A custom SAP ODI URI is removed by ActiveSync from an email message in an Exchange Server environment
KB 3135688 Preserves the web.config file for Outlook Web App when you apply a cumulative update in Exchange Server 2016
KB 3135601 Cyrillic characters are displayed as question marks when you run the “Export-PublicFolderStatistics.ps1” script in an Exchange Server 2016 environment
KB 3124242 Mailbox quota is not validated during migration to Exchange Server 2013 or Exchange Server 2016
Exchange Server 2016 Cumulative Update 1 (KB3134844), Download, UM Lang Packs