So, I'm aware that this is a brand new product an there will be little experience with it but Microsoft have been a bit shoddy here. I have had a look here.
Office 2019 is the latest version of Microsoft's productivity software that's available as a one-time purchase from a retail store or through a volume licensing agreement.
Important
Office 2019 is separate from Office that's available through Office 365 plans. For example, if you've deployed Office 365 ProPlus to the users in your organization, you don't need Office 2019. You already have all the features, and many more, that are included in Office 2019.
Volume licensed versions of Office 2019 are available for enterprise admins to download and deploy to the users in their organization. This includes the following Office products:
These Office products now use Click-to-Run, instead of Windows Installer (MSI), as the installation technology. But, how you activate these Office products – for example, by using Key Management Service (KMS) – remains the same.
Office 2019 for Mac is also available for volume licensed customers. For more information, see Deployment guide for Office for Mac.
The biggest change since Office 2016 is that the installation technology used by the new volume licensed versions of Office is Click-to-Run, instead of Windows Installer (MSI). Click-to-Run has been the installation technology for most Office products since the release of Office 2013.
In addition to Click-to-Run, the following are some other changes that you need to be aware of:
Even though there is a different installation technology, you can still use the same software distribution tools, such as System Center Configuration Manager, that you currently use to deploy Office. Also, how you activate volume licensed versions of Office – for example, by using Key Management Service (KMS) – remains the same.
The major version of Office 2019 is staying at 16.0, so some additional things are staying the same for those upgrading from Office 2016, including the following:
For information about the new features in Office 2019, see the “what’s new” articles for Access, Excel, Outlook, PowerPoint, Project, Visio, and Word. Office 2019 includes some, but not all, features that are available in versions of Office that come with an Office 365 subscription plan.
Office 2019 won’t receive additional new features now that it has been released. If you want to get new Office features on an on-going basis, you should consider moving to an Office 365 plan that includes Office. Most enterprise plans of Office 365 include Office 365 ProPlus, which includes the same Office apps as Office Professional Plus 2019. For more information, see enterprise options for Office 365 and What’s new in Office 365.
We recommend that you uninstall existing versions of Office before you deploy Office 2019. If you’re uninstalling previous versions of Office products that were installed with Windows Installer (MSI), the Office Deployment Tool can remove most of those for you as part of the installation of Office 2019. For more information, see Remove existing versions of Office before installing Office 2019.