Finding emails which included had a particular attachment is really important. Last week I happened to digg through my email box to find a n...

It is quite simple; since the filename is already known, search box on top right-hand side can be used. As shown in the below image, you need to type the filename inside inverted comma.
In this example, I am searching for a file named "Digizol.com Thunderbird Article.doc".

To summarize, three simple steps are;
1. Press 'Ctrl + k'
2. Type filename inside inverted commas
3. Press Enter
Hope this helps.
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