Microsoft has announced plans to retire the lightweight version of its Outlook Web App email client, known as OWA Light, from Exchange Server. The decision marks a significant shift in Microsoft’s focus towards modernizing its web-based email experience, and it will likely have far-reaching implications for organizations that still rely on outdated systems.
For those unfamiliar with OWA Light, it was introduced roughly two decades ago as an alternative to the standard Outlook Web App (OWA) Premium. The lightweight client offered a simplified web interface designed specifically for older browsers or systems with limited internet connectivity. However, over time, Microsoft has deprecated OWA Light in favor of its more feature-rich counterpart.
The Exchange Team cited several reasons for retiring OWA Light, including the need to reduce legacy surface area and simplify ongoing engineering work. By doing so, Microsoft aims to improve the overall user experience for customers who rely on its email services every day. The company also highlighted that modern browsers are now capable of handling more complex web applications, making OWA Light a relic of the past.
OWA Light has a limited set of features compared to the standard version, which includes weekly or monthly calendar views, access to shared mailboxes and calendars, and the ability to import or export messages and contacts. The retirement of OWA Light means that users will no longer be able to choose this option when logging in to their Exchange Server account.
While Microsoft has provided guidance on how admins can block OWA Light using PowerShell commands, it’s essential for organizations to take proactive steps to ensure a smooth transition. This includes educating users about the changes and updating security policies to reflect the shift towards modern email clients.
In light of this announcement, admins should start planning for the retirement of OWA Light and consider migrating their users to the standard Outlook Web App experience as soon as possible. By doing so, they can take advantage of the full range of features and benefits that come with using a more modern and secure email client. As Microsoft continues to push the boundaries of innovation in its email services, it’s crucial for organizations to stay ahead of the curve and ensure their systems are up-to-date and secure.
Source: Bleeping Computer — 2026-07-09