# Problem: Incompatible OX extensions with UCS5

Problem:

During upgrade check to UCS5 UCS 5.0 Release Notes
you get the following output.

The following extensions are incompatible with UCS 5.0:
	cn=66oxforucs,cn=ldapacl,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=50_ox,cn=udm_syntax,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=oxAccess,cn=udm_hook,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=oxGroupHook,cn=udm_hook,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=oxmail/oxcontext,cn=udm_module,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=oxmail/oxdomain,cn=udm_module,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=oxmail/oxfetchmailmulti,cn=udm_module,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=oxmail/oxfetchmailsingle,cn=udm_module,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=oxmail/oxfolder,cn=udm_module,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=oxmail/oxlists,cn=udm_module,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=oxmail/oxmail,cn=udm_module,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=oxresources/oxresources,cn=udm_module,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=policies/mailquota,cn=udm_module,cn=univention,dc=schein,dc=local: [3.2-0..unspecified)
	cn=oxUserDefaults,cn=udm_hook,cn=univention,dc=schein,dc=local: [unspecified..unspecified)
	cn=oxContextRW,cn=udm_hook,cn=univention,dc=schein,dc=local: [unspecified..unspecified)

Error: Update aborted by pre-update script of release 5.0-0

This could be the case, if OX was removed before and these remnands are still present. Or you run OX on an other server in your domain, and this installation is not updated to the latest version, at least Version 7.10.5-ucs4

Solution:

You can remove this old remands, if you have not OX insytalled in your domain anymore, or you upgrade to the
OX version 7.10.5-ucs4

Basic procedure for removal

udm settings/udm_hook list | grep DN
udm settings/udm_hook remove --dn $DN
accordingly also for settings/udm_module; settings/udm_syntax;
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