March 17, 2012 Unable to set flag in Outlook 2010. Windows 7 Home Edition, 64-bit. Error message when attempting to set flag: "The operation cannot be performed because the message has been changed." 9 out of 10 attempts result in this message. Ironically, messages from Wilders can be flagged! A Google search on this message reveals the general opinion that NOD32 is responsible: http://www.howtogeek.com/forum/topic/outlook-2010-cant-set-flag?replies=2 Thanks in advance.