Hi @Pavan Patel,
Welcome to Microsoft Q&A forum.
Thank you for reaching out and sharing your concern and a detailed feedback on the New Outlook flagged emails popup feature. I can totally understand the importance of flagged emails reminder popups in your daily basis.
In new Outlook for Windows, flagged email reminders do not surface as a dedicated desktop pop up in the same way as classic Outlook. Because this is a product capability gap rather than a setting you can simply enable, I recommend submitting feedback directly to Microsoft via the Feedback Portal to help prioritize this feature in future updates.
Sharing your experience through this channel is the most impactful way to advocate for a change that would benefit you and other users.
Note: As community moderators, we kindly ask for your understanding that our access to internal development details is limited. Our primary role is to guide users toward the appropriate resources and support channels. While we may not have influence product design decisions and have limited access to internal development details , we’ll continue doing our best to support you within the scope of our responsibilities.
I hope you found the answer helpful, and we would greatly appreciate it if you could mark it as accepted. This helps highlight the solution for others who may be searching for similar information in the community. Your contribution not only supports fellow users in finding the right guidance more quickly, but also helps build a more resourceful and collaborative space for everyone.
Thank you for your kindness and contributions to the forum.
If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.