There has been a lot of chatter about implications of first Lavabit and then Silent Circle's Silent Mail being shut down by their operators.
In both cases, it appears that there was information visible to the services which could be compelled by search warrants, court orders, or national security letters.
I want to assure Anonymizer users that we have no such information about Anonymizer Universal users that could be compelled. While we know who our customers are, for billing purposes, we have no information at all about what they do.
This has been tested many times, under many different kinds of court orders, and no user activity information has ever been provided, or could be provided.