Microsoft is investigating a known issue that affects Microsoft 365 customers and causes classic Outlook to hang or freeze when copying text. [...]
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source https://www.bleepingcomputer.com/news/microsoft/microsoft-outlook-workaround-fixes-freezes-when-copying-text/
source https://www.bleepingcomputer.com/news/microsoft/microsoft-outlook-workaround-fixes-freezes-when-copying-text/