New answers tagged profile-sync
There are two different things in your situation: The UPS which is responsible for keeping user attributes up-to-date with Active Directory The User Information list for a specific site collection. This list contain only the information about site users. So either they have logged on or have been explicitly added to a group or granted some sort of specific ...
If you delete the profiles you will loose the data stored in the profiles, but not the personal sites. Rather than delete the profiles, I would begin by recreating the connection. Then run a full import and troubleshoot the import with the MIISClient. If that does not work you can then try more drastic approaches.
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