Problems with OWA
At the server:
1. Apply 831464
831464 FIX: IIS 6.0 Gzip Compression Corruption Causes Access Violations http://support.microsoft.com/?id=831464
2. Clear the IIS server files follow these steps:
a. Go to your %windows%\IIS Temporary Compressed Files directory
b. Select all of the content in this directory and delete it.
3. Go to a command prompt, type "iisreset".
At the client:
1. Go to Tools -> Internet Options
2. Select Delete Files and click OK to confirm that you want to delete the
Microsoft SBS Product Support