I have Avast! Home edition 4.7 set to work with Thunderbird on Win XP Sp2: Tools/Options/Privacy/Anti-virus it set to allow anti-virus clients to quarantine individual incoming messages.
Currently, with Avast! resident protection active, when I mark a message as 'Read' it takes about 3 seconds before control returns to Thunderbird. When a message is deleted (that is marked as deleted and copied to the Trash file) this can take from 4 to 7 seconds.
When Avast! resident protection is stopped, these actions are instantaneous.
Is there a way to tell Avast! to ignore actions on messages within Thunderbird?