From the SBS 2008 newsgroups:
Symptoms: - When browsing the OWA website from the SBS Console Shared Folders and Web Sites, we get a blank white page with an error indicator in lower left corner of browser with the following error: Line: 7 Char: 1 Error: Syntax Error Code: 0 URL: https//remote.mywebite.com/owa/auth/logon.aspx? url=https://remote.mywebsite.com/owa/&reason=0 - Secondly when logged on through the RWW and you click on the Check Email, a second page is opened. This page is all white with what appears to be a directort or folder structure as links on it. They look similar to folders that would contain my emails. When I click on any of them, none seem to function. Also the page has a series of red X's on it next to the "folder" links. This behavoir is the same local as well as from remote computers.
Based on my experience, this issue may occur if the new Exchange updagte is corrupted. The latest Exchange Server 2007 Service Pack 1 update is release update Rollup 4. Please check on the Exchange server to see if it is applied, if not, please install it. If you have installed, please uninstall it and then reinstall it again. Install the latest release update Rollup 4 for Exchange Server 2007 Service Pack 1 Update Rollup 4(Version: 8.1.311.3) for Exchange Server 2007 Service Pack 1 (KB952580) http://www.microsoft.com/downloads/details.aspx?familyid=8B492ED2-EA92-412F-A852-3AA1C58D9499&displaylang=en