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APPLIES TO: 
2016 2019 Subscription Edition
Exchange Server uses a delivery model of 1-2 Cumulative Updates (CUs) per year that address issues reported to Microsoft by customers and discovered independently by Microsoft. CUs can also include features and functionality, or introduce the deprecation of legacy features that are being removed from the product. Critical product updates are used to address a Microsoft-released security bulletin or changes in time zone definitions. Critical product updates are released as needed and can typically be applied to the latest CU and the immediately previous CU.
Exchange Server SE
To get the latest version of Exchange SE, download and install Exchange Server SE RTM. Each CU is a full installation of Exchange that includes all updates and changes from previous CUs. When installing a new Exchange server using the latest released CU, you don't need to install Exchange RTM or any previously released CU.
The following table contains links to Exchange Team blog posts ("What's New" information) for this and other Exchange SE CUs.
| Version | Blog post |
|---|---|
| Exchange SE RTM | Exchange Server SE RTM |
For information about the new features you'll get when you upgrade to Exchange 2019 from previous versions of Exchange, see What's new in Exchange Server.
Exchange Server 2019
To get the latest version of Exchange 2019, download and install Cumulative Update 15 for Exchange Server 2019. Each CU is a full installation of Exchange that includes all updates and changes from previous CUs. When installing a new Exchange server using the latest released CU, you don't need to install Exchange RTM or any previously released CU.
The following table contains links to Exchange Team blog posts ("What's New" information) for this and other Exchange 2019 CUs.
For information about the new features you'll get when you upgrade to Exchange 2019 from previous versions of Exchange, see What's new in Exchange Server.
Exchange Server 2016
To get the latest version of Exchange 2016, download and install Cumulative Update 23 for Exchange Server 2016. Because each CU is a full installation of Exchange that includes updates and changes from all previous CUs, you don't need to install any previous CUs or Exchange 2016 RTM first.
The following table contains links to Exchange Team blog posts ("What's New" information) for this and other Exchange 2016 CUs.
For information about the new features you'll get when you upgrade to Exchange 2016 from previous versions of Exchange, see What's new in Exchange Server.
- To upgrade to the latest CU after you've downloaded it, see Upgrade Exchange to the latest Cumulative Update.
- For downloads and updates for other versions of Exchange, see Exchange Server build numbers and release dates.