I perform a search using the top search bar looking for a word i.e. 'Messages mentioning:' The search result shows it has found 30 emails. I click on 'Show results as list' and the new tab opens but the list only shows only 26 of the 30. When I compare the 30 with the list of 26, I see that the missing four are consecutive in the date sequence. Going back to the tab that displays the 30, and clicking on the individual messages, I find that the four troublesome messages result in 'No message found'. Going directly to the folder where I know the messages are stored, I can open the four troublesome messages OK. What should I try next to analyse the problem further? 140.1.1esr (64-bit)