My case: Exchange Server 2003, Windows server 2003, OWA published trough ISA server. OWA is working fine for all type of messages, including attach, etc... But some aleatory messages that my exchange users try to read trough OWA (only trough OWA) present the bellow error (see at the end of this messages) and they cannot read the body of such messages. About 1% of the messages handled trough my exchange server presents the problem, including messages handled internaly (from my domain to my domain). All my clients use SMTP transport. The problem is aleatory, problematic messages have nothing different in particular, like attaches or formated text, some times a message with only "test" in the subject and body can presents this problem. ----- ERROR MESSAGE DISPLAYED IN OWA (the header line is showed fine like other messages, the error apper when the user try to read the body clicking the header line). I cut this error from de Internet Explorer Browser: ------------------------------------------------------------- Begin of the cutted text The page cannot be found The page you are looking for might have been removed, had its name changed, or is temporarily unavailable. ________________________________ Please try the following: * If you typed the page address in the address bar, make sure that it is spelled correctly. * Open the Web site home page, and then look for links to the information you want. * If you believe you should be able to view this directory or page, please contact the Web site administrator by using the e-mail address or phone number listed on the Web site home page. File not found ________________________________ Technical Information (for support personnel) * More information: Microsoft Support <http://www.microsoft.com/ContentRedirect.asp?prd=iis&sbp=&pver=5.0&pid=&ID=404&cat=web&os=&over=&hrd=&Opt1=&O pt2=&Opt3=> ------------------------------------------------- End of cutted text Thanks. Daniel!