Convert Outlook for Mac (OLM) to Apple Mail, Thunderbird, Entourage, MBOX & EML
Convert Apple Mail, Thunderbird, Postbox, MBOX to PST for MS Outlook
PST Extractor Pro can convert PST to MBOX, PST to EML, PST to RGE file format.
Convert Apple Mail to Outlook 2011 for mac, Thunderbird, Entourage & EMLX to EML