Tested on a folder with more than 1000 messages. STR: 1. Select folder (I will call it ROOT for the sake of this report) 2. Tool:Collect addresses:From current folder 3. Turn on all checkboxes except "Include subfolders" 4. Go to address book. Copy one email addresses 5. Paste it on a From/To/Cc/Subject/Tag filter 6. Create a subfolder of ROOT and move the filtered messages to it 7. Repeat 4-6 for the other collected email addresses 8. Select the ROOT folder EXPECTED No messages should remain in the ROOT folder. ACTUAL Messages remain in the ROOT folder. Also repeating steps 2-3 finds new email addresses in ROOT which previously didn't show in the list of collected ones.
ETA: I am putting "Address book folder size" to 50000 (although ROOT doesn't really contain more than 10-20 addresses, I am sure of that)
looks like a duplicate of #1517 *** This bug has been marked as a duplicate of bug 1517 ***
And not fixed for whole 10 years? wow :)