Outlook 2010 attachment size limit

Question

We're using a sendmail server for our email and have been using Outlook 2003 for the client.  I'm evaluating Outlook 2010 but we've hit a snag.  Total attachments over ~20MB result in a "The attachment size exceeds the allowable limit". 
This works fine under 2003.
How can I fix this?

Answer 1

Hi,
First, please let us know the email server you are using. Is it Exchange and what’s the version? Also, does this issue occur on all the client computers or only
one some of the computers?
As this issue might be related to some settings on the Exchange server side, you may also contact your network administrator to check the settings on the server side.
If there are no attachment limitation settings on the server side, we can troubleshoot the issue by the steps below:
Step 1: Disable background transfer of attachments to the Exchange server.
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Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you
follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs.
1. Run regedit on the outlook client computer that has the issue.
2. Locate the following registry key:
[HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook]
3. On the Edit menu, click Add Value, and then add the following registry value:
Value name: DisableBGSave
Data type: REG_DWORD
Radix: Hexadecimal
Value data: 1
Note: You will see the Policies key if policies are deployed in your environment. If so, add the registry key under the following registry key:
[HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook]
4. Restart Outlook and test the issue again. Is the issue resolved? If the problem persists, let’s continue.
Step 2: Start Outlook in online mode/safe mode.
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1. In Outlook, click File > Info > Account settings > Account settings.
2. Click your Exchange account, and click the
Change button, then More settings,
Advanced tab. Uncheck Use cached Exchange mode.
3. Exit Outlook . Click Start, point to All Programs, and then point to
Microsoft Office.
4. Press and hold the
CTRL key, and then click Microsoft Outlook.
Is the problem resolved? If not, let’s continue.
Step 3: Create a new Outlook profile.
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1.    Exit Outlook.
2.   
Go to Start > Control Panel, click or double-click
Mail.
Mail appears in different Control Panel locations depending upon the version of the Microsoft Windows operating system, Control Panel view selected, and whether a
32- or 64-bit operating system or version of Outlook is installed.
The easiest way to locate
Mail is to open Control Panel in Windows, and then in the
Search box at the top of window, type Mail. In
Control Panel for Windows XP, type Mail in the
Address box.
Note   
The Mail icon appears after Outlook starts for the first time.
The title bar of the Mail Setup dialog box contains the name of the current profile. To select a different existing profile, click Show Profiles, select the profile
name, and then click Properties.
3.   
Click Show Profiles. Choose Prompt for a profile to be used.
4.   
Click Add.
5.   
Type a name for the profile, and then click OK.
6.   
Start Outlook, and choose this new profile.
If this problem does not occur in the new Outlook profile, the old Outlook is corrupted. We can delete that and use a new Outlook profile.
Step 4: If it still not resolved, create a new Outlook profile on another PC that does not have this issue, then check to see if it persists. This can help us to narrow
down that if the issue is specific to the machines.
Please take your time to try the suggestions and let me know the results at your earliest convenience. If anything is unclear or if there is anything I can do for
you, please feel free to let me know.
Best Regards,
Sally Tang