Update Rollup 6 for Exchange Server 2007 Service Pack 1 (announced a few days ago) has been released.
We would like to call out the following fixes included in this rollup:
1) Fix for a security issue which has been assigned a severity rating of critical. More information about the issue can be found in the Microsoft Security Bulletin MS09-003.
2) Fix to allow Internet Explorer 8 to be used for Outlook Web Access (OWA) 2007. This does not include the OWA 2007 S/MIME control. We are still working on some changes in the control to make it work better with Internet Explorer 8. We will be releasing an updated version of the S/MIME control in a future rollup. Users using the S/MIME control should continue to use Internet Explorer 7.
KB 959241 has more details about this release and a complete list of all fixes included in this rollup.
From the installation perspective, a reminder that the rollup installer will overwrite any OWA script files if required to ensure proper operation of OWA. If you have customized the logon.aspx page or other similar OWA pages, you will need to redo any customization after installation of the rollup.

thank you for this post.
1) Fix for a security issue which has been assigned a severity rating of critical. More information about the issue can be found in the Microsoft Security Bulletin MS09-003.
2) Fix to allow Internet Explorer 8 to be used for Outlook Web Access (OWA) 2007. This does not include the OWA 2007 S/MIME control. We are still working on some changes in the control to make it work better with Internet Explorer 8. We will be releasing an updated dizi izle version of the S/MIME control in a future rollup. Users using the S/MIME control should continue to use Internet Explorer 7.