Microsoft issues issue affecting Outlook for PC users who update to version 2005 Build 12827.20268 or later. Some users will see an error prompt saying that “Something is wrong with one of your data files and Outlook might be able to fix your file”” Microsoft lists this known issue as being caused by the June 2020 updates on a support page with fixes and workarounds for recent issues affecting Outlook. An official fix is not yet available for customers using stable Outlook versions but an initial fix is being tested by Outlook Insider Beta.”
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-says-june-2020-updates-break-outlook-for-some-users/