“Either there is no default mail client or the current mail client cannot fulfill the messaging request. Please run Microsoft Outlook and set it as the default mail client.” I have Outlook Express and do not want to change to Outlook. Most incoming e-mail is received, but about once a day or every other day I get the above error pop-up and the message is not received. I have Windows XP,SP2, Internet Explorer 7. I’ve tried Tools/Internet Options/Programs/ changing the preference from the drop down menu from OE to Outlook, back and forth but nothing seems to work and thus I occasionally miss an incoming e-mail. Any help would be much appreciated. Could it be that OE is somehow corrupted?