Hi,
Can you tell me if you have setup a provisioning group correctly ? and then run the provisioning task ?
A provisioning group is setup under Enterprise Vault > Directory on xxxx > Sitename > Targets > Exchange > Exchange Server > Provisionning Group
Here you will have to create a group for Enterprise Vault to use then allow your (or automatically) enable users. A provisioning group is basically creating a grouping of users that you wish to allow for archiving. A provisioning group can be based on Window group, Windows User, Distribution Group, OU, LDAP query, Whole Organisation.
It is recommended not to use Windows User.
If you run the provisioning task in report mode (right click task choose "run now" and choose report mode), what does it show you ? the report will be generated in program files\Enterprise Vault\reports and could be in a subfolder depending on the version of Enterprise Vault. The report should be called "Exchange Provisioning Task Reportxxxxxxx.txt"
HTH