Has anyone else experienced anything similar to the following with a recent Microsoft Outlook for Office 365 under Windows 10? How should I attempt to track it down further? If I move to any of a number of IMAP folders in the tree view containing the folder list, or if I use Ctrl-y to open a folder list and move focus to a desired folder, then I press enter to open that folder, Microsoft Outlook hangs (becomes unresponsive) and needs to be restarted. This happens when the folder is opened, not during the folder selection process. I haven’t been able to reproduce it with Microsoft Exchange folders via my work account. It appears to be an accessibility issue, in that shutting down the screen reader (either JAWS or NVDA), then opening the new folder, then re-enabling the screen reader works without hanging Outlook. As this implies, the problem can be reliably reproduced with both JAWS and NVDA, so I suspect a Microsoft issue. The server was upgraded recently (by me – it’s my own server hosted by Linode). Microsoft Office 365 and Windows 10 version 1809 have also seen recent upgrades, so it isn’t clear which change introduced the problem. All software is up to date, including the screen readers. Everything is fine in Microsoft Outlook for Mac and for iOS – it’s purely a Windows problem.