I've been using Mac Outlook 2011 for about 3 weeks with Lion, after exporting from Outlook 2007 on the PC side. The only export possibilities that the Mac version offers are an OLM file and tab-delimited format. Weirdly, it appears that the tab-delimited version does not export any of the categories that are attached to a contact. In addition, because I have extensive contact notes, including links, the export was basically a wreck. I want to go back to the PC version. Does anyone know if you can import an olm file back into the PC version of Outlook?