Retrieving specific items from virtual vault causes Outlook to crash. However, the same items can be retrieved from the mailbox archive and a full copy of the item can be opened from a PST file. The issue only occurs when these items are retrieved from Virtual Vault.
The cause of the crash is to do with how the MaintainStubPropsMessage::GetPropsImpl() method maps custom MAPI properties on the stub item in the MDC file to the corresponding full item in Content Cache.
This issue has been addressed as part of the following release:
Enterprise Vault 9.0.3 - Release Details
Enterprise Vault 10.0 - Release Details
The issue has been verified to occur on Outlook 2007 and Outlook 2010 with Enterprise Vault add-ins installed.