A strange problem and after trying countless things to resolve it - I have determined that there is one user who when they login to OWA (it's Exchange 5.5 and she using a typical I.E 5.5/6.0 web browser) - she brings the entire Exchange web down! I have to stop IIS/Web services, kill the inetsrv.exe task, restart the services and everything is ok after. Any ideas?? Thanks, Leslie