However, German software firm Open-Xchange's CEO Rafael Laguna warned that it may take some time for the changes to come into effect.
He said: "Old habits die hard, and it may take some time for these guidelines to have an impact. The German Federal Government adopted ODF file formats in 2008, and the transition has been a slow one.
"As long as Microsoft Office has a home on government PCs, proprietary file formats will remain a fact of life."
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