cc:Mail/ Exchange 2000 srvr coexistance/

Has anybody gone down this migration path? Everything’s been going great except for a minor problem that we’ve noticed in our pilot test group. This issue regards user postings to lotus cc:mail BBs & updating to Exchange public folders (we’ve got itworking in the other direction where the Exchange public folders primary for user postings and cc:mail BBs receive updates from Exchange public folders). Has anyone else run across this problem?