CDPUserSvc_3e64b is svchost.exe -k UnistackSvcGroup. Looking at that with Process Explorer, under the Services tab of the Properties of that process;
OneSyncSvc_3e64b Sync Host_3e64b
This service synchronizes mail, contacts, calendar and various other user data.
Mail and other application dependent on this functionality will not work
properly when this service is not running.
PimIndexMaintenanceSvc_3e64b Contact Data_3e64b
Indexes contact date for fast contact searching. If you stop or disable this
serice, contacts might be missing from you search results.
UnistoreSvc_3e64b User Data Storage_3e64b
Handles storage of structed user data, including contact info, calendars,
messages and other content. If you stop or disable this service, apps that use
this data might work correctly.
UserDataSvc_3e64b User Data Access_3e64b
Provides apps with access to structured user data, including contact info,
calendars, messages and other content. If you stop of disable this service,
apps that use this data might not work correctly
Also has a https connection MS server, so looking it is OneDrive \ contacts related. Properly could do with some finishing touches on the service...