EDB File Format - An Exchange Mail Database File

EML - EMail Message

EMLX

ICS - iCalendar File Format

MBOX - Email Mailbox File

MSG - Microsoft Outlook Email Format

OFT - Microsoft Outlook Email Template

OLM - Outlook for Mac File Format

OST - Outlook Storage File Format

PST - Outlook Personal Information Store File

TNEF

VCF - Virtual Contact File