Update Rollup 19 for Exchange 2007 Service Pack 3 is now available for direct download. Note that mainstream support for Exchange 2007 has already ended.
This Rollup includes an updated S/MIME Control for Outlook Web Access. Users who have installed the earlier version of the control must update it via OWA.
View: Description of Update Rollup 19 for Exchange Server 2007 Service Pack 3
Download: Update Rollup 19 for Exchange Server 2007 Service Pack 3 (KB3141352)