Microsoft shares temp fix for Outlook crashes when opening emails

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 2504 (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.

“The emerging cases for this issue are on virtual desktop infrastructure (VDI). This issue has been escalated for investigation. We will update this topic when we know more.”

Until a fix is rolled out to impacted customers, Redmond advises those affected to manually create the missing FORMS2 folder at C:\Users\\AppData\Local\Microsoft\FORMS2 as a temporary fix.

To do that, you have to go through the following steps:

  1. Close Outlook and other Office applications.
  2. Select Start > Run and enter the path %localappdata%\Microsoft and select OK.
  3. In the File Explorer menu, select New > Folder and name it FORMS2.

Microsoft is also investigating a known Outlook issue that causes mailbox folders to flicker and move around when moving items to the folders, starting with version 2505 (Build 18827.20128).

Those affected are advised to toggle off caching of the shared mailbox by disabling Download Shared Folders as a workaround. However, this will likely cause performance problems since it forces Outlook to work with the shared mailbox offline.

Last week, the company pushed a service update to fix a bug that triggered Outlook LTSC 2019 crashes when opening Viva Engage, Yammer, Power Automate, and other emails.

Earlier this year, Microsoft shared another temporary fix for crashes affecting classic Outlook when writing, replying to, or forwarding emails and rolled out a fix for another known issue causing classic Outlook and Microsoft 365 apps to crash on Windows Server systems.

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