What is the scheduled task "\Microsoft\Windows\CertificateServicesClient\UserTask" on my Windows 8 computer?

"\Microsoft\Windows\CertificateServicesClient\UserTask" is a scheduled task on Windows 8 system added as part of Windows installation.

You will see "\Microsoft\Windows\CertificateServicesClient\UserTask" listed on Task Scheduler with the following information:

Name: UserTask
Location: \Microsoft\Windows\CertificateServicesClient
Description: Certificate Services Client automatically manages 
   digital identities such as Certificates, Keys and Credentials for 
   the users and the machine, enabling enrollment, roaming and other services.
Actions: Custom handler
Triggers: At log of any user
History:
   Information 7:51:42 Task completed
   Information 7:51:42 Action completed
   Information 7:51:42 Action started
   Information 7:51:42 Created task process
   Information 7:51:42 Task started
   Information 7:51:42 Task triggered on logon
   ...

"UserTask" is scheduled to run at logon time.

It is recommended to keep "\Microsoft\Windows\CertificateServicesClient\UserTask" enabled as a scheduled task.

⇒System Scheduled Tasks on Windows 8

⇒⇒Windows 8 Scheduled Tasks