Outlook 2016 (click-to-run) Error , "Unable to open MAPI session, ClassFactory cannot supply requested class" or "Unable to open the MAPI profile's default mailbox." (4348281)

The following errors may be seen when using Migrator for Notes to Exchange (MNE) after Outlook 2016 (click-to-run version) installs the latest updates:

Here is the error when going through the migration wizard:

ClassFactory cannot supply requested class

Here is the error when attempting to click Apply on the MNE Exchange Server settings screen:

In the MNE migration log file you may see:

17:23:58 ERROR: [8874-94-20-8004011D]Unable to open the MAPI profile's default mailbox.
17:23:58 IMAPISession::OpenMsgStore():
17:23:58 MAPI error 8004011D
17:23:58 Error: The attempt to log on to Microsoft Exchange has failed.
17:23:58 Component: Microsoft Exchange Information Store
17:23:58 Low level error: 80040126
17:23:58 Context: 00000512

RESOLUTION 1:

Modify the following keys in the Windows Registry on the MNE migration server:

Note: Quest does not provide support for problems that arise from improper modification of the registry. The Windows registry contains information critical to your computer and applications. Make sure you back up the registry before modifying it. For more information on the Windows Registry Editor and how to back up and restore it, refer to Microsoft Article ID 256986 “Description of the Microsoft Windows registry” at Microsoft Support.

[HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity]
EnableADAL=dword:00000000
DisableADALExtendedApps=dword:00000001

RESOLUTION 2:

Unlike traditional versions of Outlook, click-to-run versions of Outlook update themselves automatically by default, outside of Windows Update management.

Currently, as of July, 2019, Outlook 2016 (Version 1902 (Build 11328.20368)) seems to be experiencing this issue. This the latest version of Outlook 2016 on both the "Monthly Channel" and "Semi-Annual Channel".

Downgrading Outlook to version Version 1808 (Build 10730.20360) resolves this issue as of July 25, 2019.

Here are the steps:

1.)    Disable automatic updating in Outlook | File | Office Account | Update Options | Disable Updates
2.)    Delete all existing Outlook profiles from the Mail Control Panel
3.)    Run the following two commands from an Administrative Command Prompt:
         a.    cd "%programfiles%\Common Files\Microsoft Shared\ClickToRun"
         b.    officec2rclient.exe /update user updatetoversion=16.0.10730.20360
4.)    Reboot

This Microsoft site provides additional details about the current and previous versions of Outlook 2016 (click-to-run).

This Microsoft site provides additional details about the different Outlook for Office 365 update "Channels".

This Microsoft site provides additional details about how to switch Outlook to another "Channel". To switch to one of the "semi-annual" channels (which is suggested for the MNE migration server), then set the Channel to "Broad" or "Targeted" as described in this Microsoft document.