404 server error when attaching files in OWA 2007

I have a SBS2008 server and my OWa users all have the follwing problem

When attaching a .doc/xls/pdf document document above +/- 20KB from IE of Firefox, the following error occured:
Servererror: 404 can’t find file or folder. The source you are looking for is probably removed.. The is a textbox in Dutch language. The server is Dutch.

When attaching a .txt file of other file less the +/- 20KB, everything goed normally and the mail can be sent. I tried all browsers and workstation OS, alle have the same issue.
404-error.JPG
sitproAsked:
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Gajendra RathodSr. System AdministratorCommented:
Please also check maxAllowedContentLength and maxReceivedMessageSize parameter in web.config file. it is in byte.

For example (50 MB attachments):

<requestLimits maxAllowedContentLength="51200000" />
<httpRuntime maxRequestLength="51200" />

Changed both of these entries and reset IIS,
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Gajendra RathodSr. System AdministratorCommented:
Please increase the value of  maxRequestLength parameter in web.config file of OWA.

Reference link.
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sitproAuthor Commented:
thx. Tested but even if i use 30Mb valua, the same issue occurd. I restart IIS service

<httpRuntime maxRequestLength="30000" />
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sitproAuthor Commented:
i used these two values and that worked:
<requestLimits maxAllowedContentLength="43000000" />
<httpRuntime maxRequestLength="43000" />


Solution:

http://edmckinzie.wordpress.com/2009/11/30/max-message-size-increase-owa-imap-ews-maxrequestlength-and-maxallowedcontentlength/
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sitproAuthor Commented:
the first solution wasnt working but set me on the right track
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