| .DBX | Microsoft Corporation | Arquivos miscelâneas | Outlook Express E-mail Folder | Microsoft Outlook Express | Microsoft Corporation |
| .EMAIL | Microsoft Corporation | Arquivos miscelâneas | Outlook Express Email Message | Microsoft Outlook Express | Microsoft Corporation |
| .EML | Microsoft Corporation | Arquivos Web | E-Mail Message | Microsoft Outlook Express | Microsoft Corporation |
| .FFT | Adobe Systems Incorporated | Arquivos de complementos | Adobe Audition Noise Print File | Microsoft Outlook Express | Microsoft Corporation |
| .LKO | Microsoft Corporation | Arquivos de dados | Outlook Express Linked Object | Microsoft Outlook Express | Microsoft Corporation |
| .MBX | Microsoft Corporation | Arquivos de dados | Outlook Express Mailbox | Microsoft Outlook Express | Microsoft Corporation |
| .MIM | Internet Engineering Task Force | Arquivos codificados | Multi-Purpose Internet Mail Message File | Microsoft Outlook Express | Microsoft Corporation |
| .MIME | Various Developers | Arquivos codificados | Multi-Purpose Internet Mail Extension | Microsoft Outlook Express | Microsoft Corporation |
| .MSG | Microsoft Corporation | Arquivos de Texto | Saved Email Message | Microsoft Outlook Express | Microsoft Corporation |
| .NCH | Microsoft Corporation | Arquivos de áudio | On Hold Message/Music File | Microsoft Outlook Express | Microsoft Corporation |
| .NWS | Microsoft Corporation | Arquivos de dados | Windows Live Mail Newsgroup File | Microsoft Outlook Express | Microsoft Corporation |
| .P7S | Unknown Developer | Arquivos codificados | PKCS #7 Signature File Format | Microsoft Outlook Express | Microsoft Corporation |
| .PAB | Microsoft Corporation | Arquivos de dados | Personal Address Book | Microsoft Outlook Express | Microsoft Corporation |
| .PBX | Sybase, Inc | Arquivos de desenvolvedor | PowerBuilder Extension File | Microsoft Outlook Express | Microsoft Corporation |
| .PST | Microsoft Corporation | Arquivos de dados | Outlook Personal Information Store File | Microsoft Outlook Express | Microsoft Corporation |
| .SIG | Unknown Developer | Arquivos de Texto | Signature File | Microsoft Outlook Express | Microsoft Corporation |
| .TNEF | Microsoft Corporation | Arquivos miscelâneas | Transport Neutral Encapsulation Format | Microsoft Outlook Express | Microsoft Corporation |
| .VCF | Palm | Arquivos de dados | VCard File | Microsoft Outlook Express | Microsoft Corporation |
| .WAB | Microsoft Corporation | Arquivos de dados | Windows Address Book | Microsoft Outlook Express | Microsoft Corporation |
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