From my perusal of this forum, it would appear that it is NOT possible to do the migration from Outlook 2003 desktop to Zimbra desktop; i.e., there appears to be no straightforward method to import my exported Outlook 2003 .pst file to Zimbra. This is a deal-breaker for me if that is indeed the case. After a simple computer upgrade including Win7 (which does not support Outlook 2003), I'm stuck! Otherwise, ZD looks like a fine open-source alternative, except for this. Do I need to invest $50 in Outlook 2010, or is there someone out there who can tell me how to do this hopefully simple transition. Thanks to all!