It has been observed that awareness of OER has spread faster than its implementation. There remain obstacles that hinder the mainstreaming of OER by the global educational community. The Paris OER Declaration 2012 highlighted these obstacles and had flagged them for international cooperation. While advances have been made in each area, increased efforts by the international community are still necessary. These obstacles are: 1) the capacity of users to access, re-use and share OER; 2) issues related to language and culture; 3) ensuring inclusive and equitable access to quality OER; 4) changing business models; 5) the development of supportive policy environments.