Data transfer between computers using Windows as operating system is already difficult, then imagine data transfer between Windows and Mac.
Outlook2Mac is a conversion tool of data in relation to your messaging client. It automatically converts e-mails, attached files, contacts and elements from Outlook calendar in order to be compatible with Mac. Thus, you could import these data into your OS X Apple applications.
Outlook2Mac also includes a filter option and a support for mbox, vcf, ics.