"Operation failed" error when you accept or propose new meeting times in Outlook 2010

Symptoms

In Microsoft Outlook 2010, you receive the following error message when you try to accept, or propose a new time for, a meeting request:

The operation failed. The messaging interfaces have returned an unknown error. If the problem persists, restart Outlook.

Cause

This issue may occur if the following registry value is set as follows:

Key: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\PST
DWORD: UseLegacyCacheSize
Value data: 1

This registry value may trigger the issue when Outlook is using a Cached Exchange Mode profile.

Resolution

To resolve this issue, delete the UseLegacyCacheSize registry value from the Windows registry. To do this, follow these steps.

Important Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.

  1. Exit Outlook.
  2. Start Registry Editor. To do this, use one of the following methods, as appropriate for your version of Windows:
    • Windows 8: Press Windows Key + R to open a Run dialog box. Type regedit.exe, and then click OK.
    • Windows 7: Click Start, type regedit.exe in the search box, and then press Enter.
  3. In Registry Editor, locate the following subkey in the registry:

    HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\PST
  4. Locate and right-click the following value:

    UseLegacyCacheSize
  5. Click Delete, and then click Yes to confirm the deletion.
  6. Exit Registry Editor.


More Information

If you review the Microsoft Office Alerts log, you will see an event that resembles the following:

Microsoft Outlook

The operation failed. The messaging interfaces have returned an unknown error. If the problem persists, restart Outlook.

P1: 301670
P2: 14.0.4763.1000
P3: 6xk3
P4: 0x80040811

To review the Microsoft Office Alerts log, follow these steps:
  1. In Control Panel, open the Administrative Tools item.
  2. Double-click Event Viewer.
  3. In the navigation pane, select Microsoft Office Alerts under Applications and Services Logs.
Propriedades

ID do Artigo: 3096065 - Última Revisão: 22 de set de 2015 - Revisão: 1

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