Ensure your computer is fully connected and that other web-based apps are working.
Log into your email via a browser (Gmail, Outlook.com, etc.). If you see new emails there but not in Thunderbird, the issue is likely with the client. thunderbird does not download new messages
Thunderbird needs room to save new files. Check that your computer’s hard drive or partition isn't full. 2. Repair Corrupted Folder Indexes Ensure your computer is fully connected and that
If Thunderbird thinks it has already downloaded messages but they aren’t appearing, the index file ( .msf ) for that folder might be corrupted. Thunderbird needs room to save new files
If you find that your , it can be due to anything from simple connection glitches to deeper database corruption. This guide walks you through the most common fixes, ordered from the simplest to more advanced technical steps. 1. Initial Quick Checks Before digging into settings, rule out external factors: