Sending a large attachment in OWA 2010

When users attach an attachment bigger than 35MB in OWA 2010, the users get the following error:

404 - File or directory not found

The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.

Remark: Assuming that your organization allows users sending the large attachment bigger than 35 MB.

To solve this problem, I need to modify the "web.config" file.

1. At the Client Access Server, log in as Domain Administrator.

2. Launch "Windows Explorer".

3. Navigate to "C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Owa".

4. Open "web.config" by "Notepad".

5. Search "requestLimits maxAllowedContentLength" and "httpRuntime maxRequestLength".

By default, the maximum attachement is about 35MB. I need to modify the value which is suitable for my environment.

6. Next to "requestLimits maxAllowedContentLength", change the value from "35000000" to "52428800".

Remark: The value is in byte(B).

7. Next to "httpRuntime maxRequestLength", change the value from "35000" to "51200".

Remark: The value is in Kilobyte(KB).

8. Save and exit the file.

Reference:
http://technet.microsoft.com/en-us/library/aa996835(EXCHG.80).aspx

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