DigiDoc file attached to the e-mail can not be opened, or saved to the customer computer, in the OWA (Microsoft Outlook Web Access) environment. Saving will create an empty file with the size of 0 bytes.

NB! According to latest information, this bug has been fixed in  Exchange Server 2010.  More information can be found in following Microsoft article  - 

Problem: DigiDoc file attached to the e-mail can not be opened, or saved to the customer computer, in the OWA  (Microsoft Outlook Web Access) environment. Saving will create an empty file with the size of 0 bytes.
Cause: Problem is caused by the fact that DigiDoc file is essentially XML document and for security reasons opening and saving XML documents in OWA environment will be blocked .
Solution: Solution is to configure Exchange server depending on the Exchange server version.

Exchange Server 2003
In case of Exchange 2003 it is possible to save DigiDoc document from OWA environment, but unfortunately it is not known how to open documents directly.

To configure the Exchange 2003 server to save DigiDoc files from OWA environment it is needed to install a Hotfix and modify system registry. It is assumed that the server has atleast SP1 installed.

Exchange Server 2003 SP1
In case of Exchange Server 2003 SP1 it is necessary to follow instructions at http://support.microsoft.com/?kbid=903146
Before installing the fix it's advised to check the file versions on the server. (Picture 1).

Picture 1 Exchange Server 2003 SP1

If the files are newer then it's enough to just modify the registry.

Exchange Server 2003 SP2
In case of Exchange Server 2003 SP2 it is necessary to follow instructions at http://support.microsoft.com/kb/919884
Before installing the fix it's advised to check the file versions on the server. (Picture 2).

Picture 2 Exchange Server 2003 SP2

If the files are newer then it's enough to just modify the registry.

Exchange Server 2003 registry modifications:
In case of Exchange Server 2003 SP1 and SP2 you have to modify server (in case of front-end back-end solutions, choose back-end server.) registry as follows:
- Key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\InternetContent
add STRING type..
-  ..value
AttachExtensionAllowed
which..
- ..contains
.ddoc;.Ddoc;.DDoc;.DDOc;.DDOC;.dDoc;.dDOc;.dDOC;.ddOc;.ddDC;.ddoC
Since hotfix is case sensitive, all the combinations of the file extension should be added.

Information Store service needs to be restarted to apply the changes.

Exchange Server 2007

In case of Exchange 2007 it is possible to save DigiDoc document from OWA environment, but unfortunately it is not known how to open documents directly.
Exchange Server 2007 can be configured by doing the following:

1. Make sure that the Update Rollup 6 for Exchange 2007 Service Pack 1 (http://support.microsoft.com/kb/959241/ ) is installed and if not then install it.

2. Firstly you have to complement the file Web.Config appSettings section with choice „BypassOwaXmlAttachmentFiltering“:


Default location for the Web.Config file is Program Files\Microsoft\Exchange Server  in \ClientAccess\Owa server, which has the Client Access server role.

3. In the Exchange administrative console click Server Configuration and then Client Access

4.
Right Click on Action panel subsection Outlook Web Access and choose Properties

5.
Pick either Public Computer File Access or Private Computer File Access page.

6.
In the Direct file Access section choose Enable direct file Access

Picture 3

7.
Click Customize…

8.
In the opened Direct File Access Settings window pick Allow…

Picture 4

9.
Make sure that .ddoc file type is not present in the Allow List list, or remove it if it's there.

Picture 5

10.
Click OK to save.

11. In the Direct File Access Settings window press Force Save… button

Picture 6 Force Save

12. Add .ddoc file type in the opened „Force Save List“ window.

Picture 7 Add .ddoc file type to the Force Save List

One more suggestion:

Additionally it is advised to compress the DigiDoc file using for example ZIP algorithm. This would decrease the digitally signed document size by almost 4 times, which would be much more economical for sending with e-mail.


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