The following table describes the attachment formats and extensions supported by BlackBerry Enterprise Server software version 4.1.6:
| Extension | Description |
| .pdf | Adobe Acrobat 1.1, 1.2, 1.3, and 1.4 |
| .txt | ASCII (American Standard Code for Information Interchange) text |
| .amr, .wav, .mp3 | Audio |
| .wpd | Corel WordPerfect |
| .htm, .html | HTML / Web Pages |
| .bmp, .gif, .jpeg, .jpg, .png, .tif, .tiff, .wmf | Images |
| .doc, .dot, .pps, .ppt, .xls | Microsoft Office 97, 2000, 2003, and XP |
| ..docx, .dotx, .xlsx, .pptx, .ppsx | Microsoft Office 2007 |
| .rtf | Rich Text Format |
| .zip | Compressed files / WinZip |