Unable to download certain attachments in Express or ExpressPro When running MailSite Express or ExpressPro under IIS 6, attachments with specifc extensions cannot be viewed or saved (for exmaple .efx and .btw). This is most likely caused by IIS not recognizing the extension.

When using Windows 2003 or IIS6 some file extensions may not be downloaded via the MailSite Express web-mail client (example: *.efx). This can be fixed by setting up a MIME type in IIS for the problem extension.

To define a MIME type for a specific extension, follow these steps:

1. In IIS right click on the Express (or ExpressPro) Virtual Directory. If you have a website pointing to Express or ExpressPro, then you need to make the changes at the Website level.
2. Select the 'HTTP Header' Tab
3. Click on 'MIME Types' button located at the bottom of this screen
4. Click New add the extension that you want (Example = .efx)
5. Add the Type (eg for .efx = image/efax)
6. Click OK to close all open dialogs

You can find the common extension MIME Types by doing an internet search for 'MIME Types Listing'.

Note: It is highly recommend you verify this fix by attaching a file with new the new extension type and downloading it to confirm the modifications are working properly.

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More Information about working with MIME types is available from Microsoft on the Microsoft IIS 6 Server Documentation website. You can also access the product documentation through the IIS Manager.