This technote should help: http://www.symantec.com/business/support/index?page=content&id=TECH139113

can any here to help me out to resolve this issue i have check link but there is only mention reasons i need solution to investigate this

Can you grad a client trace whilst trying to synch Vault Cache?

how can i do this please tell me the steps as i am new with EV

Hold down "CTRL+SHIFT" and click on the "Search" button, you will see a screen that will allow you to enable logging.

Close Outlook and re-open and try the synch.  Open the diagnostic screen again and you will be able to view the log. 

You can also get to it via the File -> Enterprise Vault menu option.

Add it as an attachment on here.

find attachment

The problem is here:

10/02/2012 18:24:45.810[2352]: CONTENT:BUILD: Archive is inaccessible '1C871F2709A0E104A822ACBFEC58E10D51110000EVSERVER'
 

so what will bbe the solution how to resolve this issue

Can the user get to archive explorer and see the archive?
If sounds to me like it's a closed archive

Can you please update this thread or note it with who resolved it for you (assuming resolution. The last posting asked you to check to see if you could access the archive via another means.

If you are still having an issue with this... can you please let us know the details (and perhaps an updated client log) so that we can further assist you?

Flagging resolved postings as "solved" helps to prevent those who are helping from reviewing and commenting on postings that no longer need assistance. Thanks in advanced for any updates you may provide.

Did you tried reseting the vault cache?