Enterprise Vault for Microsoft Exchange has the ability to trace Outlook Web Access processes like: opening items from vault archive or archiving items to vault.
To trace Outlook Web Access processes:

1. Open Vault Administration Console in Symantec Vault Server.
2. Go to "Tools" menu and Select ‘Advanced Features’.
3. Open the (+) sign under Enterprise Vault Servers.
4. Right click "Traces" button and click "New"< "trace".
5. Search for "Outlook Web Access issues” in the list and click "Next".
6. Name the trace and click "Next".
7. it’s possible to Increase the running time in no other heavy processes use the CPU.
8. Locate the log file location and click "Next".
9. Click "Run now" to run the trace.