Search is not finding emails that I can see are there. I looked at "Rebuilding the Global Database does not complete (Mac)" and although I use Windows, I followed the hint to look at the Activity Manager and the Error Console after an attempt to re-index failed to complete. The Activity Manager showed "Indexing 429 of 5663 messages in Sent - horshamquakermeeting@phonecoop.coop (IMAP) (7% complete)" The Error Console showed "1764413544692 addons.xpi WARN Checking C:\Program Files (x86)\Mozilla Thunderbird\distribution\extensions for addons" I used Windows Explorer to look for addons.xpi on the whole of the C: drive. Not only is there not such a file but C:\Program Files (x86)\Mozilla Thunderbird\distribution does not have an extensions folder. Also I have previously looked in C:\Users\Michael\AppData\Roaming rather than C:\Program Files (x86) to find Thunderbird files. Thunderbird is otherwise behaving well, just that I can't search for emails. I may have deleted too many files earlier when I was trying to remove an addon that I didn't want. How do I get back to normal?