Not able to upload attachements when Express running on IIS6 This document details the reasons why you are unable to upload attachments above a certain size. By default IIS 6.0 is locked-down by Microsoft and one of the features is to restrict the file size that you are permitted to up or down load to the website. In the section of More Information you will see the steps to increase this the size of files that are permitted to be uploaded. The MailSite 7 and later installers will automatically make this modification for you. The first step is to enable Direct Metabase Edit using IIS Manager 1. From the start menu select 'Administrative Tools' then click on 'Internet Information Services (IIS) Manager' 2. In IIS Manager, right-click the local computer, and then click Properties. 3. Select the Enable Direct Metabase Edit check box. Next we need to edit the Metabase XML file to enable the larger file size. 1. From the start menu select the 'Run' option and cut and past this into the box - c:\windows\system32\inetsrv\metabase.xml 2. Now search for the value "AspMaxRequestEntityAllowed" 3. Change this value to the required size. This is an example "1073741824" which is 1GB.