As Microsoft kills off Publisher, LibreOffice steps in with free support for your PUB files - XDA

Automated excerpt

LibreOffice welcomes Publisher refugees after Microsoft dropped Publisher from Office 365. They reverse-engineered the PUB file format into a libmspub library that reads and converts PUB files to ODF. This lets people read their PUB files for free and convert them to OpenDocument Format (ODF).

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