Most of us that have worked with Outlook for some time have come across this feature.  You try to send a file to a colleague and Outlook blocks and displays a nice message for you:

Outlook blocked access to the following potentially unsafe attachments: []

Of course the kneejerk reaction is to just rename the extension and resend the email.  While this works the majority of the time, it requires extra steps, time and some forethought before sending the email (while increasing your mailbox size).  A more permanent solution (albeit more dangerous) is to modify the Outlook policy itself either through a registry edit or using a GPO.

Other and more preferred options include:

  1. Use a file share or FTP site to save and access the attachment.  This is a Messaging administrator’s dream as it takes the burden off the Exchange servers and places it solely onto the file server.  While message storage is usually at a premium, file share storage can be much cheaper.
  2. Use a file compression utility to change the file name extension.  This works great and often saves valuable mailbox space in the process.  Two birds with one stone.

Searching the Internet on this topic brings up many posts (this is not an new topic), and while most seem to be focused solely on how to modify the behavior at the client level, I’ve included some links that the administrator can utilize to adjust the attachment filtering behavior at the server level.
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Exchange 2007/2010

Step 1

Run the powershell command: get-exchangeserver (2007 / 2010)

Example: get-exchangeserver | ft name,admindisplayversion,exchangeversion

Use these link for more guidance if needed

Get the version, build and service pack level of Exchange.

Click here to determine the version for Exchange 2010…

Step 2

Reference the following links for complete build version information

Review this link for a complete limiting of build numbers and release dates for Exchange.

To get detailed information on Exchange 2007 platforms, editions and versions including Rollup information follow this link…

Exchange 2003

For information of determining your version information for Exchange 2003 using the registry click here…

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I didn’t discover this trick, but that never stopped me from sharing.  Originally based off the Master Control Panel for Vista.

Want a good way to access ALL the control panel options in Windows 7 in one easy location?  Simply make a folder on your desktop and rename it GodMode.{ED7BA470-8E54-465E-825C-99712043E01C} and you are all set.

FYI: I’ve heard that the trick will work in Vista x32 but not Vista x64.

Here is what GodMode will look like:


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A couple of big changes were announced at the end of last week:

  1. A PIC license will no longer be required for federation with AOL.
  2. Federation costs with Yahoo! will be reduced by 50%.
  3. A new XMPP Gateway for OCS 2007 R2 provides presence and two-party IM interoperability with the XMPP based systems of Jabber and Google Talk.

More Information

Click here to read the official announcement from the OCS Team…

Click here to download more information on the XMPP Gateway

XMPP Gateway limitations

  • Virtualization of the XMPP Gateway is not supported.
  • Collocation of the XMPP Gateway with other OCS roles is not supported.
  • Only plain text is supported.
  • Notes from OCS are not supported nor is custom status on the XMPP clients seen by OCS.
  • The XMPP Gateway will only federate with OCS 2007 R2 and OCS 2007.  LCS 2005 federation is not supported.
  • Messages from the MOC client are not delivered to the last active instance of the XMPP client when an XMPP user is logged in with two or more clients.
  • When an XMPP user adds an OCS buddy, the OCS user’s presence is not seen on the XMPP client until the OCS user’s presence changes.
  • Conferencing is not supported on the gateway.

Configuring the XMPP Gateway

Connectivity to Gmail…

Connectivity to Jabber XCP 5.4…

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