Hi Everyone, I hope you all are happy and safe. I have a problem with Tunderbird and wonder if anyone has some additional tips for me on how I might be resolving this. I have a very large mail account. I am using Thunderbird already since Mozilla Mail 2 times. My account have about 65 million messages. All was OK, but recently (since I am on TB78) it started to loose the indexes of the folders. This creates issues for the search and especially for the message filters. I have hundreds of filters for Incoming mail. So every other day the folders are not indexed so that the mail filter stops because it cant access the folder. So I stop it and re-index the folder by compacting it. But it keeps on happening for month now. Does anyone have a idea why the index is lost. I did delete all .msf files and did go to each folder to have it all re-indexed. But still they loose the index of time or it gets corrupted. Never had any of these issues pre TB78. Any pointer would be very much appreciated since I am out of ideas. Best wishes, Thom