Microsoft has been operating in Ireland since 1985. It has increased its international mandate by encompassing three divisions at its campus in Sandyford, Dublin which employs over 1,500 including contractors. In addition, Microsoft officially opened its Windows Live EMEA Data centre in 2009 at Grangecastle, Dublin.
- Microsoft EMEA Operations Centre (EOC) established in 1985 and provides key support for the company's sales and customer support activities to over 120 countries around Europe Middle East and Africa.
- The Microsoft European Development Centre is focused on engineering excellence. It conducts the full lifecycle of software development from research and development, to engineering and localisation across many of Microsoft's different business groups.
- Microsoft Ireland (Sales, Marketing and Services Group) established in 1991 and services customers throughout Ireland. The SMSG group manages all sales, marketing, services and technical support for partners and customers of all sizes from enterprise customers, to small and medium sized businesses and home computer users.
- In 2009, Microsoft opened the doors of its 303,000sq.ft Windows Live EMEA Data Centre in Grangecastle, Dublin with an investment of $500 million to host and deliver Microsoft Cloud Computing products and services for markets in EMEA. The data centre has been officially recognised by the European Commission’s Sustainable Energy Europe Campaign as a “best practice” in environmental sustainability through its innovative design which has made it 50 percent more energy efficient than traditional data centres built three years ago.