Migrating from Outlook on the Mac to Outlook on Windows can be a challenging task as the two platforms store mailbox data in different file formats. OLM files are used by Outlook for Mac and PST files are used by Outlook for Windows.

Outlook MSG files are good for storing single email messages, but not always handy when emails need to be shared, archived, printed, reviewed or submitted as formal documentation. PDF, however, is commonly used for preserving and distributing documents across different systems.