1. https://www.ithome.com.tw/news/143001
2. https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/
3. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26855
4. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26857
5. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26858
6. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27065
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