The PST format is a file format used by Microsoft Outlook to store email messages, contacts, and other data.
An OST (Offline Storage Table) file is a file used by Microsoft Outlook to store emails, contacts, tasks, and other data locally on your computer.
An NST file is a storage file created by Outlook Connector for IBM Lotus Domino. This add-in for Microsoft Outlook allows users to access Lotus Notes through Outlook.
An OLM file is a data file used by Microsoft Outlook for Mac. It contains email messages, contacts, calendars, tasks, and other data used by Outlook.
MBOX files are a popular format for storing data like emails, address book, tasks, etc. from Thunderbird, Operamail, Seamonkey, Apple Mail.
EML files are used to save the content of the message, along with the subject, sender, recipient(s), and date of the message. It is the standard format used by Microsoft Mail, etc.
An MSG file saves emails, attachments, contacts, taskes, events, etc within Microsoft Outlook. It uses .msg file extension to save the data in your PC.
An OFT file is an email template created by Outlook that contains an email message with pre-formatted layout that can be used for creating custom messages with a similar appearance.
DBX files are used to store mailbox data from Outlook Express. This includes messages, contacts, calendar items, and notes. It uses .dbx file extension for saving the data.
Google Takeout files are the files that are save while you take backup of your Gmail mailbox using free Google Takeout Service. This files can be saved in .mbox or .zip format.
A Maildir file is a special type of email archive that stores messages in a systematic order. This makes it easy to search through your archives and find the message you are looking for quickly.
A vCard file is a standard format for storing contact information that may include the name, address, email address, phone numbers, and other details of each contact..
Eudora file is a format used by the Eudora mail client. It stored email messages on your computer as .eml files and allowed you to access them with various software applications.