Hello.
i'm little confused about GAL. Recently I experimented with Address book policy. For my ABP, i created test GAL with Recipient filter {(CustomAttribute1-ne 'Test')}. After that i noticed, users with test in CustomAttribute1 now is missing in Default GAL when looking them in OWA or Outlook. But if i open "preview recipients the global addreess list includes" in default GAL properties, i can see all recipients.
It turns out if I have two GAL, they summed up filters?