We're running an Exchange 2000 / Outlook 2003 setup in our company, and have up until now had no problems at all. NOD32 v2 has been serving us well and never caused a problem. In the usual way it seemed time to refresh the anti-virus clients to make sure we were protected, and I tested a few boxes with NOD32 v4.0.474 - as far as I could tell they were fine (bar an initial problem with the NOD32 Outlook plugin, which needed to be disabled). I rolled it out in our callcentre the other week, and unfortunately all has not gone well. The occasional sent email is blank, in both the sent items and the recipients email inbox. ALL users in our callcentre are experiencing the problem, though I cannot find a trigger. With the amount of emails sent this is causing a huge problem, and I need to resolve it as quickly as possible. What could be causing the problem and how can I go about trying to fix it? I am tempted to go back to v2 but I would like to try and get v4 working properly..