B2B. The Netherlands-based €4.3bn-revenue Wolters Kluwer has sold its 40% of the Austrian information specialist MANZ’sche Verlags- und Universitätsbuchhandlung GmbH for €17m in cash. But its most significant corporate development this week was a malware attack on the Dutch company’s tax and accounting software platform which has paralysed many accounting firms for days. It has sparked concerns about the security of the tax return and financial information stored on the company’s cloud servers. Wolters Kluwer provides software and services to all of the top 100 accounting firms in the US and 90% of top global banks.