https://www.bleepingcomputer.com/news/microsoft/microsoft-fixes-outlook-crashes-in-june-office-2020-updates/

Microsoft released the June 2020 non-security Microsoft Office updates with performance improvements and fixes for issues affecting Windows Installer (MSI) editions of Office 2016, Office 2013, and Office 2010 products.

The KB4484398 update addresses causing intermittent crashes in Outlook 2016 and shared folders to disappear from Favorites when Outlook starts in an offline state.