Switching to a new version of Outlook can be a mixed experience. While Outlook 2023 introduces several new features and improvements, it also brings challenges, especially for those who rely heavily on personal and public folders. This guide will help you restore lost personal folders when transitioning to Outlook 2023 and discuss why users dependent on public-folder features might need to stick with classic Outlook for Windows.

Understanding Personal Folders in Microsoft Outlook
Personal Folders in Microsoft Outlook refer to a type of data file that stores a user’s emails, calendar events, contacts, tasks, and other items locally on their computer. These folders are essential for organizing and managing personal information within the Outlook application.
Key Aspects of Personal Folders
1. Outlook Data Files (.pst):
- Definition: A Personal Storage Table PST file is an Outlook data file that stores messages and other items on your computer.
- Usage: These files are used mainly for POP3 and IMAP accounts, which download and store email messages from a mail server to your local computer.
- Location: By default, .pst files are stored in the Documents\Outlook Files directory on Windows.
2. Offline Outlook Data Files (.ost):
- Definition: An Offline Storage Table OST file is another type of Outlook data file used primarily by Microsoft Exchange, Office 365, and Outlook.com accounts.
- Usage: These files allow you to work with your mailbox data even when you are not connected to the internet. Changes are synchronized with the server when a connection is reestablished.
- Location: By default, .ost files are stored in the AppData\Local\Microsoft\Outlook directory on Windows.
Importance of Personal Folders
1. Data Management: Personal Folders help users manage their emails, calendar events, contacts, and tasks effectively by organizing them into different folders.
2. Offline Access: With .ost files, users can access their mailbox data even without an internet connection, ensuring continuity of work.
3. Backup and Archive: Personal Folders can create backups of important emails and other data. Users can also archive old emails to free up space in their primary mailbox.
How to Restore Lost Personal Folders When Switching to New Outlook?
The new version of Outlook provides limited support for public folders, which can be a significant drawback for users who depend heavily on these features. Public folders are used for shared access to emails, calendars, contacts, and tasks among multiple users in an organization, but new Outlook does not support the personal folder and imposes limitations as mentioned below
Key Limitations:
- Creating Public Folders: In Outlook 2023, you cannot create new public folders.
- Modifying Public Folders: Editing or modifying existing public folders is restricted.
- Deleting Public Folders: Deleting public folders is also limited in the new version.
It means that if you are switching to a new Outlook from the existing one; then you are likely to lose all the personal folder data and never get access to it until you don’t bounce back to the classic Outlook. However, it is highly recommended to backup Outlook data file to overcome any sort of data loss.
Thus, if you rely heavily on public-folder features for collaboration and shared access, it is suggested to continue using the classic Outlook for Windows. The classic version provides full functionality for creating, modifying, and deleting public folders, ensuring that your workflow is not disrupted.
Conclusion
Switching to the new Outlook 2023 doesn’t have to mean losing your folders. By following the steps outlined above, you can successfully restore your data and continue using Outlook seamlessly. This is because New Outlook is not a replacement for Outlook for desktops; it is meant for users who are using the Win 10 / 11 Mail / People / Calendar app. Thus, the features and functionalities of both the Outlooks are unrelatable so the toggle button is provided by the team to allow smooth switching between the two Outlooks as per your requirement. However, if public folders are integral to your workflow, sticking with the classic Outlook for Windows is advisable.