Exchange 2013 CU 17 highlights:
KB4024652 Repeated IMAP SEARCH BODY requests may not return newly delivered messages in Exchange Server
KB4024651 The "MessageRetrievalMimeFormat" setting isn't honored for plain text-only email messages in IMAP in Exchange Server
KB4024650 Emoji is displayed as question marks in iOS clients in an Exchange Server environment
KB4024647 "The property is too long" error when you update the "Department" field of user mailbox in Exchange Server 2013
KB4024646 "Insufficient access rights" error when you run setup.exe as member of "Delegated Setup" group in Exchange Server 2013
- TLS 1.2 Exchange Support Update
- .Net Framework 4.7 compatibility with these releases
Exchange Server 2013 Cumulative Update 17 does not include updates to Active Directory, but may add additional RBAC definitions to your existing configuration. PrepareAD should be executed prior to upgrading any servers to Cumulative Update 17.
More info : https://blogs.technet.microsoft.com/exchange/2017/03/21/released-march-2017-quarterly-exchange-updates/
Risk : After you install this cumulative update package, you can't uninstall the package to revert to an earlier version of Exchange Server 2013. If you uninstall this cumulative update package, Exchange Server 2013 is removed from the server.
CU Download URL : https://support.microsoft.com/en-in/help/4012114/cumulative-update-17-for-exchange-server-2013