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with avast 7 the email accounts had to be manually changed by the user, you have to manually reverse that/those change/s in your email programs account settings.
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avast 8 was able to work without these changes, but having manually made the changes for avast 7 to work, you still need to reverse those earlier changes to the email programs account settings.
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regardless of what you choose to do you are going to have to reverse the previous changes.