When this issue occurs, you can see the fax email attachments in the email messages. However, the .tif or .tiff extension is lost and you cannot open the attachments directly.


This issue occurs because Exchange Server 2013 removes the file name from the Content-Disposition header. For example, the original header is Content-Disposition: inline; filename="fax.tif", and the new header is Content-Disposition: inline. Therefore, Windows cannot recognize the file and cannot select an application to open the file. 


To resolve this issue, install the following update:

2936880 Cumulative Update 5 for Exchange Server 2013


To work around this issue, you can download the attachments, and then rename the attachments by adding a .tif or .tiff extension.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about the .tif and .tiff format, go to the following Wiki website:

General information about Tagged Image File FormatFor more information about the Content-Disposition header, go to the following Microsoft website:

General information about the Content-Disposition header

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