Microsoft has acknowledged a significant issue affecting Outlook in the Windows 11 24H2 update, which may prevent the application from launching altogether. This troubling development comes as Microsoft 365 Enterprise users anticipate a mandatory shift to the new Outlook version in April 2026.

The problems stem from the compatibility of the Google Workspace Sync tool—designed to integrate Google Workspace data such as emails, calendars, and tasks with Outlook. Users experiencing the issue may encounter an error message stating: "Cannot Start Microsoft Outlook. Cannot Open the Outlook Window. The set of folders cannot be opened. An unexpected error has occurred. MAPI was unable to load the information service."

Fortunately, Microsoft has reported that the latest version of Google Workspace Sync (4.3.68.0) resolves the issue. However, until users install this update, Microsoft has indicated that a compatibility hold will be enacted, which means the Windows 11 24H2 update will not be pushed to those affected by the Outlook issue. Last week, the tech giant announced it would be expanding the rollout of the operating system update to more devices.

Microsoft also advises users to reach out to Google Workspace Support if they continue to face the compatibility hold even after updating the sync tool for 48 hours.

In tandem with the Outlook difficulties, Microsoft has shared crucial news about the fate of Outlook Classic. According to announcements via the Microsoft 365 Message Center, users of Microsoft 365 for Enterprise can expect the transition to the new Outlook to commence in April 2026, albeit with a temporary option to revert back to the classic version.

The new Outlook comes packed with a more modern user experience, enhanced by features including Copilot capabilities, thematic customization, and a suite of productivity-enhancing tools such as the ability to pin emails and snooze notifications.

Microsoft has clarified that the new migration will only apply to Microsoft 365 Enterprise licensees, and can be managed through specific administrative policies to allow or exclude users from experiencing the update. Notably, this change will not affect those with perpetual licenses or on-premises accounts.

To prepare its users adequately, Microsoft commits to providing at least 12 months' notice before implementing significant changes. This proactive approach aims to ease the transition and ensure users can adapt without disruption.

As Microsoft continues to navigate the complexities of software integration and updates, users are urged to stay informed about these changes to maximize their efficiency in this evolving digital landscape. Keep an eye out for future updates as the company makes strides to enhance your Outlook and Windows experience!