PST
Personal Storage Table
OST
Offline Storage Table
MBOX
Mailbox
Portable Document Format
EMLX
Email Message (Mac OS X)
HTML
HyperText Markup Language
HTM
HyperText Markup
OLM
Outlook for Mac
SQL
Structured Query Language
MDF
Master Database File
NDF
Next Database File
CSV
Comma Separated Values
vCard
Virtual Contact File
XLS
Excel Spreadsheet (Legacy format)
XLSX
Excel Spreadsheet (XML-based)
XPS
XML Paper Specification
TXT
Text File
DOC
Document (Microsoft Word, Legacy format)
MBOX
Mailbox
DOCX
Document (Microsoft Word, XML-based)
TEX
Text (LaTeX document)
BAT
Batch File
JPG
Joint Photographic Experts Group (JPEG)
JPEG
Joint Photographic Experts Group
PNG
Portable Network Graphics
GIF
Graphics Interchange Format
TIFF
Tagged Image File Format
BMP
Bitmap Image File
RTF
Rich Text Format
PSD
Photoshop Document
VHD
Virtual Hard Disk
VHDX
Virtual Hard Disk Extended
AVHD
Automatic Virtual Hard Disk
AVHDX
Automatic Virtual Hard Disk Extended
DBX
Database Exchange
PPT
PowerPoint Presentation (Legacy format)
ICS
Internet Calendar Scheduling
DjVu
Déjà Vu (Digital Document Format)
ODT
Open Document Text
EPUB
Electronic Publication
NSF
Notes Storage Facility
DXL
Domino XML Language
DWG
Drawing (AutoCAD)
Visio
Visio Drawing (Microsoft Visio)
EPS
Encapsulated PostScript
EDB
Exchange Database
CDR
CorelDRAW
PSB
Photoshop Big
WEBP
Web Picture
HEIC
High Efficiency Image Coding
JFIF
JPEG File Interchange Format
XML
eXtensible Markup Language
Winmail DAT
Windows Mail Data
ZDB
Zimbra Database
NST
Notes Storage Table
VDI
Virtual Disk Image
VBOX
VirtualBox
VMFS
Virtual Machine File System
VMDK
Virtual Machine Disk
BKF
Backup File
VSD
Visio Drawing (Legacy format)
VSDX
Visio Drawing (XML-based)
VDW
Visio Web Drawing
VSS
Visio Stencil
VST
Visio Template
VSX
Visio Stencil (XML-based)
VTX
Visio Template (Legacy format)
VDX
Visio Drawing (XML-based)
VSSX
Visio Stencil (XML-based)
VSTX
Visio Template (XML-based)
VSDM
Visio Drawing Macro-Enabled
VSSM
Visio Stencil Macro-Enabled
VSTM
Visio Template Macro ‐ Enabled
PFC
Personal Filing Cabinet
TGZ
Tarball Compressed with GZIP
MSF
Mail Summary File
Microsoft Outlook
Comprehensive, business-focused email management tool.
Thunderbird
Open-source, customizable, secure email client.
Apple Mail
Default, user-friendly macOS/iOS client.
Spark
Collaborative, modern, team-focused email client.
Airmail
Fast, customizable, macOS/iOS-specific client.
Mailbird
Efficient, unified, Windows-compatible email client.
eM Client
Feature-rich email client with integrated calendar and chat
Postbox
Email client focused on productivity and organization with advanced search.
The Bat!
Secure email client with extensive configuration options and filtering rules.
Claws Mail
Lightweight, fast, simple email client.
Opera Mail
Basic email client, browser ‐ integrated.
SeaMonkey
Web browser with integrated email.
HCL Notes
IBM collaboration tool, email client.
Gmail
Google Mail ‐ Google's popular email service provider.
Outlook.com
Outlook Web App ‐ Microsoft's online email service platform.
iCloud
Internet Cloud ‐ Apple's cloud-based email and storage.
Hotmail
Former Microsoft email, now Outlook.com.
Office 365
Microsoft’s productivity and email suite.
Exchange Server
Microsoft's enterprise email server software.
Google Workspace (G Suite)
Google’s business productivity and email.
Yahoo Mail
Yahoo's web-based email service.
AOL
America Online ‐ Early online service with email.
Comcast
ISP providing email and services.
Amazon WorkMail
Amazon's secure business email service.
Rackspace
Cloud provider offering hosted email services.
IBM Verse
IBM's enterprise email collaboration platform.
Hosted Exchange Server
Cloud-based Microsoft Exchange email hosting.
FastMail
Private, fast, and secure email.
GMX
Free and advertisement-supported email service.
IceWarp Cloud
Business email and collaboration platform.
Aruba
Italian provider offering cloud-based email.
GoDaddy
Web hosting and domain email services.
HostGator
Web hosting with included email accounts.
BlueHost
Hosting provider offering email services.
HostMonster
Web hosting with email functionality.
MDaemon Cloud
Email server solution in cloud.
DreamHost
Web hosting with email services included.
FTP Email Accounts
Email access through FTP protocol.
EarthLink
ISP offering email and web services.
Email.com
Simple email service, advertisement ‐ supported.
Asia.com
Regional email service with an Asian focus.
Europe.com
Regional email service, European focus.
Rediffmail
Indian web-based email service provider.
BOL
Brazilian email and news service.
Axigen
Email and collaboration server platform.
AIM
AOL's instant messaging and email.
ISP
Internet service provider, offering email.
Microsoft Exchange Server
Enterprise email, calendaring, and collaboration.
Postfix
Open-source, high-performance mail transfer agent.
Sendmail
Versatile, widely-used mail transfer agent.
Exim
Flexible, configurable mail transfer agent.
Zimbra
Open-source, collaboration and email suite.
Dovecot
Secure IMAP and POP3 server.
Courier Mail Server
Lightweight, modular mail server system.
Axigen
Business email and collaboration server.
IceWarp
Unified communications and email server.
MailEnable
Windows-based email server with features.
Kerio Connect
Email, calendar, and collaboration server.
IBM Domino
Unified communications and email server.
hMailServer
Free, open-source mail server software.