Microsoft has shared a workaround for a known issue that causes the classic Outlook email client to crash when opening or starting a new message.

These problems affect users in the Monthly Enterprise Channel who updated Outlook for Microsoft 365 earlier this month, starting with Version 2,504 (Build 18730.20122).

“When you open or start a new email, classic Outlook crashes. This issue occurs because Outlook cannot open the Forms Library,” the Outlook team says in a support document published on Friday.