Files with nbo suffix appear to be some kind of configuration files from Novell Nterprise Branch Office.
NBO file extension - Novell Nterprise Branch Office configuration file
What is nbo file? How to open nbo files?
File type specification:
File extension nbo seems to be mainly associated with the Novell Nterprise Branch Office, an appliance-based solution for managing remote offices from a central location.
This type of .nbo file stores some kind of configuration settings for Branch Office.