Many functions will be removed or not supported since Fall Creators Update
Some will soon be removed before there is an alternative feature, such as Reading List or Sync, though not many people use these features. Below is a list that helps users plan to adapt to changes if needed, this list may change.
Applications / features removed:
3D Builder: no longer installed by default. Consider using Print 3D and Paint 3D instead. However, it can still be downloaded from the Windows Store.
Apndatabase.xml: see detailed information about alternative databases in this article. https://msdn.microsoft.com/windows/hardware/drivers/mobilebroadband/planning-your-apn-database-submission
Enhanced Mitigation Experience Toolkit (EMET): Will be blocked. Consider using Exploit Protection of Windows Defender Exploit Guard instead.
Microsoft Paint. Will be posted on the Windows Store for people to download for free in the future.
Outlook Express: remove this old source code.
Reader: the feature will be integrated into Microsoft Edge.
Reading List: the feature will be integrated into Microsoft Edge.
Syskey.exe: remove this no longer useful security feature. Encourage using BitLocker. For more information, read the Knowledge Base below. 4025993 Syskey.exe will not be supported on Windows 10 RS3 and Windows Server 2016 RS3. https://support.microsoft.com/en-us/help/4025993/syskey-exe-utility-is-no-longer-supported-in-windows-10-rs3-and-window
TCP Offload Engine: previously switched to Stack TCP. For more information, read the article below. https://blogs.technet.microsoft.com/askpfeplat/2017/06/13/why-are-we-deprecating-network-performance-features-kb4014193/
II6 Management Compatibility: encourages users to choose a replacement scripting tool and a new management console.
IIS Digest Authenticaiton: encourage the use of alternative authentication methods.
RSA / AES Encryption for IIS: encourage the use of CNG encryption provider.
Set up synchronization: the current synchronization process will be temporarily suspended. In the future, cloud storage systems to synchronize settings will be used for both Enterprise State Roaming users and other users. (Currently, these users are using different cloud storage systems.)
Trusted Platform Module (TPM): TPM.msc and TPM Remote Management: replace with the new user interface.
System Image Backup (SIB): Encourage using a solution to backup all drives from other units.
TLS RC4 Ciphers: default is off. For more information, read this article. https://docs.microsoft.com/en-us/windows-server/security/tls/tls-schannel-ssp-changes-in-windows-10-and-windows-server-2016