File extension .MAI
Full Name | Developer | Category |
---|---|---|
Microsoft Mail Message Format | Microsoft | Data Files |
The .MAI file extension is associated with the Microsoft Mail, an email application developed by Microsoft to be used within businesses and corporations. It was also usable with the Exchange Server and Outlook, allowing users to access their digital mailboxes via any compatible software. It is a proprietary format that is supported by the Windows operating system as well as Windows 365.
The .MAI files are used for archiving emails, messages, or folders. This allows them to be saved in a secure location and kept from being lost through accidental deletion. The messages can then be restored into a specified mailbox at any time. Email attachments can also be saved in this type of file format.
Similar File Extensions
Other file extensions that serve similar roles include .DBX, .PST, .EML, and .MSG.
Technical Details
These files contain plaintext information about each email's header, MIME body parts and stored as a combination of Unicode and ANSI plaintext, binary content, subject lines, senders/receivers, dates, times, etc. MAI files can be accessed manually using text editing programs though they should never be edited (unless directed to do so).
Opening MAI Files
MAI files can only be opened by Microsoft Mail for Exchange 4.0, Microsoft Outlook 97, 98 and 2000 as well as Windows 365. Note that new versions of Outlook no longer support the.mai extension inside of its program instead opting for an alternative file format ( .MSG)
.Programs for WINDOWS system
After installing the required software, the operating system will usually automatically associate an unknown file type (in this case .MAI) 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 .MAI 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 .MAI 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 .MAI 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 .MAI extension. Select a different software from our list and install it on your computer. After the software is installed, repeat inspection openings of a .MAI file. Sometimes you have to repeat the operation several times.
Other instructions
If none of the programs listed by us to work with the .MAI 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 .MAI file, or any other file format. In addition, there is a chance that it will be a free program, and its functionality (concerning the .MAI file) will be extended to the maximum.
It is also good to check
- if the .MAI 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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