How do you turn off the trial home avast on a Mac leopard temporary?
- on 10.5, turn off "presistent mode" in preferences first
- quit the application and agent from menu
- delete the /Applications/avast\!.app directory
but, I really doubt that the corruption is caused by Avast!, because Avast! doesn't modify the Mail's internal database - it only scans (passively) the incoming items.
Anyway, you can uncheck mail support in Preferences (and, optionally, also clean the rule in Mail preferences), and avast will stop scanning your incoming mails. Furthrer, renaming GetRulesScript.txt in /Applications/avast\!.app/Contents/Resources to something else (append underscore or so), will stop avast's interest in Mail definitely. I wonder whether this will help you or not with that effect...
pc