Symptoms:

While using Outlook 2010 the following error window appears:

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Mail Manager

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Error: 0x4005, (16389)

Function: MAPIInitialize

Context: Arup::DmLib::OasysMapi::CPostOffice::initialise

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Cause:

Uninstalling a newer version of Outlook.

When this is the case, delete the following registry key of the newer version that was uninstalled:

Outlook 2013: [HKEY_CLASSES_ROOT\TypeLib\{00062FFF-0000-0000-C000-000000000046}\9.5]

Outlook 2016: [HKEY_CLASSES_ROOT\TypeLib\{00062FFF-0000-0000-C000-000000000046}\9.6]

•	Exit Outlook and via the Windows Task Manager and ensure that Outlook.exe and MailManager... .exe's are not running.

•	Ensure that the application that created the key above has been uninstalled, if not delete the registry key manually.

•	Repair the installation of Outlook 2010.

•	Restart Outlook 2010