Microsoft Office 2010 Engineering

The official blog of the Microsoft Office product development group

Fix for Message Size Issue in Outlook 2010 Beta

Fix for Message Size Issue in Outlook 2010 Beta

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Recently, we posted information on the Outlook blog about a bug in the Microsoft Office 2010 Beta that increases the message size of some e-mails messages sent from the Microsoft Outlook 2010 Beta. The Office team has been hard at work building a fix for this issue, which is available immediately.

Download Outlook 2010 Beta fix for 32-bit Office 2010

Download Outlook 2010 Beta fix for 64-bit Office 2010

This fix prevents future messages from consuming unnecessary space, but doesn’t resize existing messages. If you reply or forward an existing message that is affected by this bug, it remains enlarged. To help reduce the impact of large messages on your Inbox and mailbox storage quota, you can also run Conversation Cleanup (new feature in Outlook 2010) on large folders. On the Home tab, in the Delete group, click Clean Up. Also, consider starting new message conversations or threads when possible.

Although Office 2010 is in Beta and is not final, we are both excited and humbled by the fact that more than 2.5 million people have downloaded and used the Beta. We want to make sure you have a great experience with Office 2010. If you are using the Office 2010 Beta, take a moment to download this important fix.

  • which beta is this for?

  • @gkeramidas - This is for Outlook, as available in the Microsoft Office 2010 Beta announced at


    Larry Waldman [MSFT]

  • Great, Thanks for the fix.

  • I am in the Office 2010 Home & Business Click To Run TAP. When I download the fix and run it, it can't find my install of Outlook 2010 running inside the App-V sandbox. How can I apply updates to apps inside the App-V sandbox??

  • Does each beta program download when you start it? The programs seem to take a long time starting up.

  • hi people

    i am using a 2010 beta and i spent some time searching for a View all headers command in Outlook (in order to see the originating ip of an email).

    Perhaps I will find it but it's not in an obvious place. There's no Properties at right click in the message list.

    perhaps a quick action for view headers would be useful

  • I get "expected version of the product was not found". Is this the same beta that was released on MSDN?

  • I get the same message as the previous commenter, which was that the installer couldn't find any product installed that required the patch.  I think I know why it's not seeing my Outlook 2010 version but I can't prove it.  What I think is happening is that I'm running Windows 7 Enterprise x64 but running Office 2010 Professional x86.  I think there's logic missing from the install validation that assumes that if your OS is x64, then look for Office x64, and vice versa for x86.  Not sure if that's true or not, but for whatever reason it isn't finding my install.

  • Installed fine on my Windows 7 x64, running Office 2010 x86 Beta as of 13/02/2010 11:30AM +1100. My Outlook version is 14.0.4536.1000.

    My Office 2010 download was from, not MSDN if that matters.

  • i commented above about the View Headers feature.

    I found this feature accesible Properties on the new File tab in the ribbon and it's the same old dialog box since office 97

  • I have the 64 bit version of Windows 7 and wonder why I only received the 32 bit version of Office 10

  • What does this patch actually do? I am relucant to simply use a patch which is not clear as to the impact.

    Also, all too many mails sent from Outlook are sent with both text and (sadly rather bloated) HTML as well as with SMIME signatures. If senders really want to reduce the size of mails then they should start there!

    Finally, I just tried this patch and it claims no applicable products on my system - I see I am not alone.

  • Finally... this has been a big PITA causing constant nagging from IT that my mailbox was getting too big... all due to these 950KB e-mails that should have been 40KB.

  • I shifted to word 2010beta,  have now problem in printing my envelopes as I used the  word 2007. Could you please fix this problem for me . thanks in advance

  • Is there any chance us Outlook users will see fixes before the RTM is released for some of the other problems such as fixing the new mail notification problems?

    Or, is there a chance that when the RTM is released, us Beta users will get access to updates via Windows Update so that we'll be able to use the RTM instead of this (still slightly buggy) Beta version?

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