When attempting to archive item in OWA 2010 from within Conversation View, a check is not made for policy-specific requirements. An item will be archived with the following hardcoded values:
a. The owner's archive will be used.
b. The default retention will be used.
c. A Shortcut for the item will be created.
d. The original item will be removed.
When Conversation view is enabled in OWA 2010, the OWA add-in will not check the assigned policy and will default to the above settings.
Disable Conversation View in OWA2010.
This issue has been addressed as part of the following release:
Calls to getarchivesettings.asp do not occur in OWA2010 during archival, causing policy values to not be applied (Ex. No shortcut creation)
Enterprise Vault 9.0.3 - Release Details
Enterprise Vault 10.0.1 - Release Details