There is only one file type that uses the .OLK14TASK extension:
Outlook Task File
File used by Microsoft Outlook for Mac, a calendar and email application that replaced Microsoft Entourage; contains a task, or "to-do," that was created in the program; used for marking messages that are flagged for follow up.
OLK14TASK files are saved automatically by the software when a new task is created. They are not manually opened or saved by the user since the software interface provides access to the tasks.
Updated: November 3, 2010