Solution
Scanning large email messages and attachments can cause problems in ESET Smart Security 4.x and ESET NOD32 Antivirus 4.x, which might cause the message and attachments to become corrupted in Microsoft Outlook Express. An update will be available soon to rectify the issue permanently. As a work-around, ESET recommends turning off Offline Scan, especially in push installations on large networks. Please follow the instructions below to switch off Offline Scan in your ESET product:
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Open ESET Smart Security or ESET NOD32 Antivirus. How do I open my ESET product?
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Press F5 to open the Advanced setup window.
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Expand Email client protection and click Email clients.
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Deselect the check box next to Read email click OK to save your changes.
Figure 1-1
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