NAV 2010 scan of Thunderbird inbox+trash?

NAV 2010 Classic - XP Sp3 - Thunderbird 2.0.0.25

 

During a scheduled scan of the drive where TB's mail files are located NAV detected and removed 4 trojans, referred to as Trojan.Sasfins (in my case, zip files which contain .exe files doing bad stuff if executed).  I had manually deleted these (2) incoming messages, but they were still in Trash.  And, as I hadn't compacted the Inbox before I ran the NAV scan, I presume they were still in the Inbox also (2).

 

Question: during a regular drive scan, does NAV open Inbox/Trash to find and remove these infected messages, and, if yes, can NAV do so with a 100% certainty of not damaging these files?  If I lost Inbox, no so good .. even though I could restore from Quarantine.

 

Thanks, CBA