You can upgrade Kaspersky Security for Microsoft Exchange Servers 9.0 Maintenance Release 4 or later versions to the current version 9.0 Maintenance Release 6. Upgrading from earlier versions is not supported.
The application is upgraded using the Setup Wizard or the command line.
The Maintenance Release 6 version of the application does not support Data Leak Prevention functionality. After the application is upgraded, the DLP Module and its related data will be unavailable. If your organization requires continued use of the DLP Module, install the Maintenance Release 4 version of the application.