We have a network of 24 users and all use MS Office 2010 Pro in an MS SBS 2003 environment running Exchange.
One user is reporting that when he sends or receives a scheduled Task to/from someone that his Outlook won't accept it. The specific error in Outlook is "The task cannot be sent. It may be an attachment of another message."
As a work-around the user has been flagging task assignment emails for follow-up with special reminders.
Thanks for the guidance. So far I have uninstalled/reinstalled Office under the user's login. I will first try deleting the mail profile and recreating it. I'll then try the other things listed and have been suggested next Thursday. I'll come back then and post what it turned out to be and accept a solution. Thanks again!