Forum Discussion
Folders in Outlook Classic empty after update
I use Outlook classic, locally on my laptop. With folders for specific topics and subfolders for sub-content. After an update[Windows 11, last update was 2025-10-15 Cumulatieve update voor op Windows 11 Version 24H2 for x64 gebaseerde systemen (KB5066835) (26100.6899) and 2025-10-15 Cumulatieve update voor .NET Framework 3.5 en 4.8.1 voor Windows 11, version 24H2 voor x64 (KB5066131)] , all main folders are still present, all subfolders also still there but ....completely empty. After the first heart attack, found out that all info is still available in webmail - that I never use. But apparently Outlook Classic does not anymore collect all previous info. New email does still arrive in my Outlook Classic. When I open Outlook Modern, all folders and subfolders are there - but only available online. Since I travel a lot, I prefer the locally available Outlook Classic. What to do?
1 Reply
This usually happens when Outlook’s local data file (PST or OST) isn’t syncing correctly after a Windows update. The update you mentioned (KB5066835) has caused similar issues for other users. To fix it, try checking your Outlook account settings to make sure the correct data file is set as default, then reset your folder view under the View tab. If that doesn’t help, you can recreate your Outlook profile or delete and rebuild the local cache (OST file), which forces Outlook to re-sync all folders from the server. Since your emails appear in Outlook Modern and on the web, this is almost certainly a sync or profile issue, not data loss. Hopefully, after reconnecting or rebuilding the data file, your folders and emails will show up again locally.
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