8.4. Configuring Attachment Blocking for OWA 2003
Problem
You want to restrict OWA 2003 users' ability to open attachments.
Solution
Using a graphical user interface
Log on to your Exchange Front-End server.
Open the Registry Editor (regedit.exe).
Select the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSEx-changeWeb\OWA registry key.
Choose New→ DWORD Value from the Edit menu; name the new value DisableAttachments.
Double-click DisableAttachments and set the value as appropriate:
0(the default)Makes attachments available, subject to the file-type blocking described in the Discussion section
1Blocks access to all attachments from within OWA 2003. Outlook, IMAP, and POP users can access attachments normally
2Allows attachment access for only those users who connect to back-end Exchange servers or to the specified front-end servers only
If you want to allow access to attachments from one or more front-end servers, do the following on your front-end servers:
Select the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSEx-changeWeb\OWA registry key.
Choose New→ String Value from the Edit menu; name the new value AcceptedAttachmentFrontEnds.
Double-click AcceptedAttachmentFrontEnds and enter the names of the front-end servers through which you want to allow users to access attachments. For multiple servers, separate the server names with spaces.
Using a command-line interface
The following command sets the DisableAttachments value:
> reg add HKLM\System\currentcontrolset\services\MSExchangeWeb\OWA ...