Symantec made an early release available of the Enterprise Vault client 9.0.1. This version works against server 8.0.4 and 9.0 and is supported for Outlook 2003, 2007 and 2010 (x86 & x64). The full set (client and server) is scheduled for December.

You can read the announcement here. You can download the Vault 9.0.1 client from Symantec File Connect.

Update: It seems there’s a trial located here. Also, don’t forget to check for hotfixes which can be downloaded here.