File extension .MMF
Full Name | Developer | Category |
---|---|---|
Microsoft Mail Message Format | Microsoft | Data Files |
The .MMF file extension is associated with the Microsoft Exchange Server software. It is used to store emails in the Microsoft Outlook client. Massage Message Files (MMF) are used by Interactive Messaging Access Protocol for communication between the server and client. These files are stored using a designated Multi-Purpose Internet Mail Extension. MMF files are encrypted to help protect the message data from being read by unauthorized individuals.
Technical Details
The .MMF files have encryption data embedded into them that helps protect message data from being read without the decryption key. The files are comprised of a series of interdependent packets that are indicative of the content of the email message. All messages are sent using an 8-bit character set as part of standard protocol. When received, the file's structure is maintained and its content can be accessed without any alteration. In addition, there are other similar file extensions used for this purpose, such as .MSG, .EML, .MIM, .OST, etc.
Programs for WINDOWS system
After installing the required software, the operating system will usually automatically associate an unknown file type (in this case .MMF) with the new application. If this does not happen, we can help the system a bit by selecting the software for it, which it should always use to open files with the .MMF extension.
When choosing the software we can select the system to use this software every time.
Remember!
Using it for the first time it is good to check whether the .MMF file opened in the application can be read by us and opens in a way that allows us to use it. If everything is in order, select this option the next time you open a file with the .MMF extension. However, if the file has not opened correctly, we have to look for a different software, with which we can open files with the .MMF extension. Select a different software from our list and install it on your computer. After the software is installed, repeat inspection openings of a .MMF file. Sometimes you have to repeat the operation several times.
Other instructions
If none of the programs listed by us to work with the .MMF file has not meet your expectations, you can try searching other websites. But remember to avoid downloading programs "that can open any file". These applications not only have very limited functionality, but may also expose you to expense tens of dollars when purchasing a license.
In the vast majority of cases you will find the program dedicated to support the .MMF file, or any other file format. In addition, there is a chance that it will be a free program, and its functionality (concerning the .MMF file) will be extended to the maximum.
It is also good to check
- if the .MMF file has no errors
- or if it has been copied (or downloaded by the browser) thoroughly
Author’s guidelines

Mr B. Adam
Author of the guidelines / Founder of FileExtension.info
New technologies enthusiast, helping to solve problems with the files.
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