That is MyIC home. OTUC was old name. PBX and ldap internal directory was first options. You could also add external ldap directories like Windows AD for example.
When we perform a search on MyIC, for example: directory 64599, the results are:
According to MyIC documentation:
So, first instance is from OTUC/PBX and the last result instance is from LDAP.
We've checked PBX, OTUC and LDAP and theres no 64599 directory related to Surname2-Name2, neither on outlook personal directory.