TS - Outlook attachment being blocked

Microsoft Windows server 2003
January 21, 2011 at 00:41:18
Specs: Windows 2008 server R2, Xeon Hexa Core 2,2Ghz / 16GB
I've got this annoying little problem. We have a small network of 5 people, working from within a windows 2008 terminal server. It's a single-server scenario.

They run Outlook 2010 with IMAP for mail, and the problem is some attachments are being blocked by the "zone block". Word files (.doc) are impossible to open unless you save the file > right-click it and unblock it first.

Obviously I've googled my brains out, and all articles point to the group policy > comp conf > administrative templates > Windows components > Attachment manager, just as this petri.co.il article does (same for Vista, win7 and 2008 as far as I can tell): http://www.petri.co.il/unblock-file...

However. I've edited the GP and activated the option "Do not preserve zone information in file attachments". This had no effect at all though. And considering this is a terminal server environment, I though "well hey it must be set in the local GP of the specific server" - but no. This also failed.

The next step was to set the originating zone as trusted in Internet Options, but that didn't work either. I just can't get rid of it. Does anyone know of a way?

Edit: I didn't see the Server 2003 tag when I published my question, sorry for the confusion.

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January 22, 2011 at 19:04:49
Okay, it took me about 5 hours of reading and extensive use of google to find this out, but here's the solution (for future reference):

There are two things you need to change. One is Windows way of handling non-secure files, the other is the application that reads the file. In this example I'll assume it's a .doc file (note: .docx files have never been an issue, only the older .doc format).

Open regedit and go to:
If the "Security" key doesn't exist you'll have to add it. Then, highlight the Security-key and add a new string value called "Level1Remove". In the value data box you're suppose to enter the file extensions you want *excepted* from security measurements, but that will not work, instead leave it blank and it'll work. I also had to add another string value with name "Level2Remove" (also leaving this value data box blank).

Next, from within Word, go Options > Security center > Settings > Protected view > untick "enable protected view for attachments in Outlook" (sorry if the text isn't accurate, I'm translating here).

There you go, you should be able to open the file from within Outlook. This time you'll probably get the old "are you sure you want to open this" with the option to untick the "always ask..." box.

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April 11, 2011 at 03:04:52
Thanks for this, Phatsta. You de man!

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