We are planning to migrate to ZCS from Exchange 2003. A lot of users have in their Outlook locally on PC also Archives (PST files). I know migration tool can import PST files into mailbox on Zimbra, but I don't want all this mails to be imported into Zimbra server.

So my questions are:
- is it possible to open PST file with Zimbra Desktop?
- what is best to do with this PST files that are located on user's PC?
- what are possibilities in Zimbra Desktop when mailbox is over size limit? Archiving like Outlook?
- can PST be converted into something Zimbra Desktop can read?