OLDI was the first EUROCONTROL standard to come in effect in 1994. It was developed to replace the verbal coordination process between Air Traffic Service Units (ATSUs) and automate the notifications, coordinations and transfer of the flight between ATSUs through data message exchanges. The OLDI Specification has not been maintained since the publication of Edition 4.2 in 2010. NETOPS/16 agreed with the need to review/update the OLDI specification and requested the EUROCONTROL Network Manager to establish a working group to undertake the necessary work within a limited timeframe. One of the tasks for this group was to assess the present level of compliance with the OLDI standard, using the available data (NOP, LSSIP, IDSG reports) and additional mechanism if required. In that respect, an OLDI deployment questionnaire has been developed and provided to all participating ANSPs on 21 January 2017. 28 ANSPs responded to the questionnaire providing their OLDI deployment details; This report contains the main findings from the responses received as well as the recommendations for further actions/next steps.