//Not found if using ou = ("departmentNumber");
Mar 23 22:45:54 sogod [39338]: |SOGo| starting method 'GET' on uri '/SOGo/so/c***@****.org/Contacts/**/b***.m*****@*****.org/view'
Mar 23 22:45:54 sogod [39338]: <0x0x55fcc1cdfbd0[NGLdapConnection]> Using ldap_initialize for LDAP URL: ldap://**************************:389/????!StartTLS ldap://*******************:389/????!StartTLS
2017-03-23 22:45:54.291 sogod[39338] -[NGLdapConnection _searchAtBaseDN:qualifier:attributes:scope:]: search at base 'o=****,dc=******,dc=**' filter '(*****=b******.*****@***************.org)' for attrs '*'
Mar 23 22:45:54 sogod [39338]: [WARN] <0x0x7f389780bcc0[WOxElemBuilder]> could not locate builders: WOxExtElemBuilder,WOxExtElemBuilder
2017-03-23 22:45:54.312 sogod[39338] EXCEPTION: <NSException: 0x55fcc1d99560> NAME:NSInvalidArgumentException REASON:Tried to add nil to array INFO:(null)
 

//OK if using o = ("departmentNumber"); 
Mar 23 22:55:59 sogod [39846]: |SOGo| starting method 'GET' on uri '/SOGo/so/c***@****.org/Contacts/**/b***.m*****@*****.org/view'
Mar 23 22:55:59 sogod [39846]: <0x0x55ee442a1740[NGLdapConnection]> Using ldap_initialize for LDAP URL: ldap://**************************:389/????!StartTLS ldap://*******************:389/????!StartTLS
2017-03-23 22:55:59.226 sogod[39846] -[NGLdapConnection _searchAtBaseDN:qualifier:attributes:scope:]: search at base 'o=****,dc=******,dc=**' filter '(*****=b******.*****@***************.org)' for attrs '*'
Mar 23 22:55:59 sogod [39846]: |SOGo| request took 0.032945 seconds to execute
Mar 23 22:55:59 sogod [39846]: xx.xx.xx.xx "GET /SOGo/so/c***@****.org/Contacts/**/b***.m*****@*****.org/view HTTP/1.1" 200 611/0 0.034 - - 0