Support for Exchange x500 addresses
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When migrating from one exchange organization to another, x500 addresses are required to prevent NDRs when replying to cached addresses and old messages. You can manually add these addresses to a mailbox, but websitepanel removes them when modifying emailaddresses...
Here's some content someone created for DNP which describes how to perform a migration, but addresses added manually don't stick in the latest version of WSP
http://help.dotnetpanel.com/DotNetPanel%20Hosted%20Exchange%20Solution/Migration%20between%20different%20AD/Exchange%20environments.aspx