A computer-implemented expertise mining system is configured to update an expertise database based on a recommender's out of office and/or auto-reply settings for a communication application, such as an email application or social media application. The expertise system obtains the recommender's auto-reply settings directly from the communication application. The auto-reply settings include message body text for out of office and auto-reply messages. The expertise system then extracts recommendation data from the auto-reply settings; and updates an expertise database based on the recommendation data extracted from the auto-reply settings.
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