History
The first version of Sumatra PDF, designated version 0.1, was based on Xpdf 0.2 and was released on 1 June 2006. It switched to Poppler from version 0.2. In version 0.4 it changed to MuPDF because of speed improvement and better support for the Windows platform, since Poppler decided to focus on integration with Unix platforms. Poppler remained as alternative engine, and from version 0.6 it was automatically used to render pages that MuPDF failed to load. Poppler was removed in version 0.9, released on 10 August 2008.
Version 1.0 was released on 17 November 2009 after more than three years of cumulative development, and version 2.0 was released on 2 April 2012, over two years after the release of version 1.0.
The first unofficial translations were released in 2007 by Lars Wohlfahrt before Sumatra PDF got official multi-language support.
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