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| Name | MOBI | DOCX |
| Full name | MOBI - Mobipocket | DOCX - Office Open XML Document |
| File extension | .mobi, .prc | .docx, .docm |
| MIME type | application/x-mobipocket-ebook | application/vnd.-openxmlformats-officedocument.-wordprocessingml.-document |
| Developed by | Mobipocket SA | Microsoft |
| Type of format | Ebook file format | Document file format |
| Description | Mobipocket SA is a French company incorporated in March 2000 that created the .mobi e-book file format and produces the Mobipocket Reader software for mobile phones, personal digital assistants (PDA) and desktop operating systems. | The Office Open XML file formats are a set of file formats that can be used to represent electronic office documents. There are formats for word processing documents, spreadsheets and presentations as well as specific formats for material such as mathematical formulae, graphics, bibliographies etc. |
| Technical details | The Mobipocket e-book format is based on the Open eBook standard using XHTML and can include JavaScript and frames. It also supports native SQL queries to be used with embedded databases. The Amazon Kindle's AZW format is basically just the Mobipocket format with a slightly different serial number scheme, and .prc publications can be read directly on the Kindle. The Kindle AZW format also lacks some Mobipocket features such as JavaScript. | Office Open XML documents are stored in Open Packaging Convention (OPC) packages, which are ZIP files containing XML and other data files, along with a specification of the relationships between them. Depending on the type of the document, the packages have different internal directory structures and names. |
| File conversion | MOBI conversion | DOCX conversion |
| Associated programs | Mobipocket Reader | Microsoft Office, LibreOffice, Kingsoft Office, Google Docs. |
| Wiki | https://en.wikipedia.org/wiki/Mobipocket | https://en.wikipedia.org/wiki/Office_Open_XML_file_formats |