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Office 2013 Professional is the oldest Office generation still sold here, and it stays useful on ageing Windows machines that cannot comfortably run a recent suite. Microsoft ended its support in April 2023, so this is a compatibility choice rather than a security one. Chkey.ch offers it as a perpetual retail licence.
The Professional edition includes Word, Excel, PowerPoint, Outlook, OneNote, Publisher and Access. The file formats are the same .docx and .xlsx used today, so documents travel to colleagues on newer versions without any conversion.
Your key is emailed within 24h, Swiss invoice included.