I export outlook for mac file from my i Mac, it become outlook for mac LOG.olm and size is about 10.24GB

Then I import this LOG.olm file to my outlook for mac of Macbook, but I found .pst file only in my outlook for mac file.
When I export my Outlook contacts specifying a specific category it shows up as a text file? I want to export my contacts by category to get a usable report format. What is the easiest method. I have the latest OS Mountain Lion on my iMac.
I used the Export in the Outlook into an external USB disk but it failed. The .olm files could not be Exported. Several times it went into Rebuild of Microsoft Database Utility which also did not fix the problems. It was so easy to Export the Outlook database in PC but very difficult to Import into Outlook for Mac and now impossible to Export from Outlook for Mac. I do regret getting the Outlook for Mac.

I think Microsoft Outlook for Mac should not be sold to the public until it is fixed completely.