Few months before we had to restart our server after installing updates. After restarting we found that many of the services are not running and our exchange is not working. So we turned on all the exchange services and exchange started working smoothly. Later we found that the outlook web access is not working. We turned on IIS and some other services too.At last owa started showing the login page and we were able to log in to the mail.But still we cannot access any mails as the links for the mails are not working.