Note: You will receive 2 Keys:

Windows 10 Pro Professional Key Global *1
Microsoft Office 365 ProPlus Professional Plus Global *1

Windows 10 Professional Key Global
Get the new and improved Windows when you upgrade to Windows 10. You'll soon discover that it is familiar to Windows users, but a more personalized experience that takes everything you already love about prior versions like Windows 7 and 8 to the next level. Your apps will work great in all modes, on all Windows enabled devices. Browse Microsoft Store and you'll find plenty of amazing devices that are designed to work perfectly with the latest version of Windows.

Microsoft Office 365 ProPlus Professional Plus Global
Office 365 ProPlus is a subscription that comes with premium apps like Word, Excel, PowerPoint, Outlook, Teams, Publisher, and Access (Publisher and Access available on PC only). The apps can be installed on multiple devices, including PCs, Macs, iPads, iPhones, Android tablets, and Android phones.
Office 365 ProPlus also comes with services like 1TB of OneDrive storage, and Microsoft chat and phone support. ProPlus includes exclusive intelligent capabilities like Ideas in Excel and Researcher in Word, real-time collaboration, and advanced security features.  With a subscription, you get the latest versions of the apps and automatically receive updates when they happen.

Can Office365 and Office2019 be converted to each other? How to convert?
The two can be converted to each other. The conversion method is as follows:
—Download the Office Tool Plus.exe tool and open it;
—Select [Activate] and clear the previous license;
—Choose the version you want to convert and install;
—Open the Office suite is the Office software you want.