Legitamate Emails suddenly going to Junk Mail

I have several different clients on separate networks who today started having legitimate emails go to their junk mail folders in outlook. Even in some cases internal email. Has there been some sort of MS update causing this and can I do anything to change it back? I realize the users can go into the messages and hit 'Not junk' but I can't do this for hundreds of people on different companies. Is there something from a server or network standpoint I can do to undo this problem?
Axis52401Security AnalystAsked:
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Lee OsborneSenior Infrastructure EngineerCommented:
It's funny I should see this post, as I've just put the phone down to someone who keeps saying they haven't received my (external) email!

Although this is Outlook 2003, the last MS filter update was December 13th, so pretty recent. I presume, by your tag, you're using Outlook 2007? There were no junk mail updates for Outlook 2007 in December, so depending on when you think this started happening, it may not be this.

Sorry I can't be of more help right at this moment, but I'll be looking into it later. If I find anything else out, I'll let you know!

Axis52401Security AnalystAuthor Commented:
Yea I can't see it being a configuration since its happening for multiple clients just today and I haven't changed anything. They all use Exchange 2003 but stlil nothing has changed their either
Lee OsborneSenior Infrastructure EngineerCommented:
Are you using Microsoft Security Essentials (my user is)? Without looking, I can't remember whether this has email protection too.

I'm just trying to think what could have changed very recently.

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Axis52401Security AnalystAuthor Commented:
No none of my clients are
There was also an Office 2010 junk filter update in December:


Is this sufficient to explain what you are seeing or is the issue widespread on 2007 installations as well?

It is possible Office 2007 installations have started automatically updating with sp3, it was released in October but they don't normally make these updates default for a couple of months. There would be a lot of cumulative updates in that SP.

Axis52401Security AnalystAuthor Commented:
I am having the users check their PC's for this update now, will advise what I find.
Axis52401Security AnalystAuthor Commented:
I didn't find that MS update on any of the stations, can I disable the junk mail folder entirely?
On individual outlook clients, yes.

E.g. http://www.groovypost.com/forum/microsoft-office/how-to-disable-junk-mail-filter-in-outlook-2010-t96454.html

If you're talking about all outlook clients then you are looking at a group policy I'd say or some other way of pushing out the registry values linked to in the link I include above.

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Axis52401Security AnalystAuthor Commented:
I also tried that and messages still go to the junk mail folder. One client has a scanner that emails scans to them and even those emails go into the junk mail folder. Of course I can add that email address to the safe sender list and that works but the list of other emails is too large and too many users to do that on every station
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