AD user in SharePoint people picker

SharePoint People Picker: Values are pulled from Active Directory each and every time the control is loaded   ALSO shows accounts that are on the site collection, no matter their status, enabled, disabled, or deleted.

For the accounts loaded from AD, by default only shows enabled accounts.  If you want it to show both enabled and disabled accounts, we have to set an AD custom filter on each site collection where you want to show disabled users.  The filter string will be similar to:   (&(objectCategory=person)(objectClass=user)(|(userAccountControl:1.2.840.113556.‌​1.4.803:=2)(!userAccountControl:1.2.840.113556.1.4.803:=2)))

or this might also work: (&(objectCategory=person)(objectClass=user)

It can be set with:  stsadm -o setproperty -url http://url -pn peoplepicker-searchadcustomfilter -pv

There is no way to show accounts that are no longer in AD.

SharePoint User Profiles: Values are synchronized each evening from Active Directory

No filters currently on this, will import both enabled and disabled, but we can set a filter.

Deleted users and sites are cleaned up periodically

See this article for more details: 

http://www.harbar.net/archive/2011/02/10/account-deletion-and-sharepoint-2010-user-profile-synchronization.aspx