Our issues with cpu usage with very large mailbox databases (4 million mailboxes) persist and I started poking at source code this morning, finally having time to look for a fix again. I originally wrote about this some time ago: http://comments.gmane.org/gmane.mail.imap.cyrus/32964 Again, we have no use for a shared mailbox namespace but there doesn't appear to be any way to easily disable it. Could it be as simple as just removing everything but NAMESPACE_INBOX from the enum in imap/mboxname.h? In other words, if we change it to enum { NAMESPACE_INBOX = 0 }; will anything else break? John -- John Madden Sr UNIX Systems Engineer / Office of Technology Ivy Tech Community College of Indiana jmadden@xxxxxxxxxxx ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/