p7mViewer 4.5 is a standalone application designed to view files and e-mail messages encrypted and/or signed in compliance with S/MIME standard.
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| General features |
 | Displays content of smime.p7m and other files with file extension p7m |
| Extracts attachments |
| Verifies and displays message security |
| Provides diagnosis on undecrypted messages |
| Cryptography support by CryptoAPI |
| Message handling |
| Verifies opaque and transparent digital signature |
| Decrypts encrypted messages |
| Decodes multi-layer messages |
| Supports Key-ID certificate identification |
| Supports Issuer&Serial Number certificate identification |
| Cryptography |
| CryptoAPI based access to cryptographic devices and software |
| Smartcard support through CSP (requires software supplied by the smartcard manufacturer installed) |
| Direct PFX files handling for decrypting messages |
| Certificate revocation checking |
| Diagnostic functions |
| Displays all available information on recipients of encrypted messages |
| Displays detailed diagnostic information on undecrypted messages |
| Displays detailed information on certificates installed in the system available to Windows applications |
| Windows Environment Integration |
| Displays secure Microsoft Outlook messages ® |
| Displays Microsoft Outlook Express messages ® |
| Utilizes CryptoAPI for cryptographic services, which gives access to certificates installed in the system, security providers, cryptographic algorithms and devices |
| Drag&drop attachment extraction |
| .p7m files' context menu for easy attachment extraction |
| Attachments |
| Displays and extracts files with their folder structure (if folder information is present). |
| displays detailed information about attached files and folders. |
| handles .p7m files nested as secure folders. |
| Performance |
| Effificiently handles arbitrarily large files |
| Handles multiple security layers |
| Very low memory usage during attachment extraction |
| Displays as much content of broken (e.g. incompletely retrieved) files as possible |
