Just installed Netware 6.5 SP6 to its own OU and when all was said and done, I found that there was an extra OU titled 0_1. When I look at the properties, the "Other name" field reads: Tomcat-roles.

It appears to be a direct copy of the Tomcat-roles OU, but there's a link between the two in which if I remove a group or member of a group in one OU, it's removed in the other.

Everything appears to be working normally, but I've never seen an extra OU just show up like that before. Any idea why such a thing would happen? Just curious!