I have jBoss portal 2.6.3 (under Linux), downloaded and installed as binary distribution, bundled with jBoss. Now I need to upgrade it to 2.6.4. The problem is that the developers deployed a lot of software, and it would take long to deploy it again. So I cannot just download and unpack binary distribution 2.6.4 to the new directory. I also cannot delete $JBOSS_HOME/server/default/deploy/jboss-portal.sar directory and replace it with the new version as described in Upgrading section of the reference guide - all the deployed software will be deleted. Please, tell me how to upgrade the portal.