On a computer that has Microsoft Office Outlook 2007
installed, when you try to open an Outlook Message Format (.msg) e-mail message
file that contains many attachments or many recipients, you may experience one
of the following symptoms:
- When you double-click the .msg file to open the message in
Outlook 2007, the message does not open. Additionally, you receive the
following error message:
The operation failed due to
a registry or installation problem. Restart Outlook and try again. If the
problem persists, please reinstall.
- When you use a MAPI-based application such as MFCMapi.exe
to view the properties of an .msg file, the message does not open.
Additionally, you receive the following error message:
To resolve this issue, follow these
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. For more information
about how to back up and restore the registry, click the following article
number to view the article in the Microsoft Knowledge Base:
How to back up and restore the registry in Windows
- Apply hotfix 951995.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
Description of the Outlook 2007 hotfix package: April 28, 2008
- Add the AttachmentMax registry entry and the
entry. To do this, follow these steps.
Note The default value for the AttachmentMax registry entry is 2048
attachments. The default value for the
entry is 2048 recipients. If you set these registry entries to larger values,
it can cause long delays when you try to open .msg files that have lots of recipients or
attachments. This is expected and is the reason the original limit was
- Exit Outlook 2007.
- Start Registry Editor.
- In Windows Vista, click Start
, type regedit in the Start Search box,
and then press ENTER. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
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- In Windows XP, click Start, click
Run, type regedit in the
Open box, and then click OK.
- If you do not use policies, locate and then click
the following registry subkey:
- If you use policies, locate and then click the
following registry subkey:
- On the Edit menu, point to
New, and then click DWORD Value.
- Type AttachmentMax, and then
- Right-click AttachmentMax, and then
- In the Value data box, type a value,
and then click OK.
- Repeat steps c through g to add the
RecipientMax registry entry.
- Exit Registry Editor.
has confirmed that this is a problem in the Microsoft products that are listed
in the "Applies to" section.
Article ID: 952295 - Last Review: January 4, 2011 - Revision: 2.0
- Microsoft Office Outlook 2007
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