Hi Paul,
Could you tell us more details about “multiple exchange accounts and each their own address book”?
If those 50K contacts are downloaded from SFB server, you could remove them from share folder which you have defined when you create SFB topology as the following snapshot, then re-rebuild
SFB profile and re-launch SFB to check the 50K contacts has been removed:
Best Regards,
Jim Xu
TechNet Community Support
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