Exchange 2010 Migration Using Outlook 2013

Hi all!
  I'm really trying hard to move away from MS Exchange to MDaemon for many of my clients, but I'm having a repeatable error with the migration tool: MDMigrator.exe [3.0.4.0 - from MDaemon 21.0.1.4 32Bit]. I can migrate the Domain Admin User Account that the Outlook profile is setup as. I have tried two different Domain Admin User Profiles and both end up importing the Outlook 2013 [32Bit] profile's Domain Admin Account but no other accounts will import, not even the other Domain Admin Account. I generally pick another five Exchange User Accounts to test this process. I get this error every time:
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Migrating from Microsoft Exchange Server 2000-2010...
MAPI logon successful
Could not open mailbox root folder, hr=8004010f
Could not open mailbox root folder, hr=8004010f
Could not open mailbox root folder, hr=8004010f
Could not open mailbox root folder, hr=8004010f
Could not open mailbox root folder, hr=8004010f
Public Folder: Archived Emails already exists, skipping
Public Folder: Internet Newsgroups already exists, skipping
Distribution List: allusers@MyCompany.com
Distribution List: allusers@MyCompany.com
Migrated 0 mailboxes, 0 messages, 0 public folders, and 2 distribution lists
Skipped 0 mailboxes, 2 public folders
Output written to E:\MDaemon\Logs\Migration.log
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The Migration.log file has the same exact wording for the error:
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14:49:03] INFO, Migrating from Microsoft Exchange Server 2000-2010...
14:49:03] INFO, MAPI logon successful
14:49:03] DEBUG, Opened MAPI Address Book
14:49:03] DEBUG, Primary domain: MyCompany.org
14:49:03] DEBUG, Opening Exchange private store
14:49:03] DEBUG, Attempting to login to mailbox: USERAME1
14:49:03] DEBUG, Logged on to mailbox: USERAME1
14:49:03] ERROR, Could not open mailbox root folder, hr=8004010f
14:49:03] DEBUG, Attempting to login to mailbox: USERAME2
14:49:03] DEBUG, Logged on to mailbox: USERAME2
14:49:03] ERROR, Could not open mailbox root folder, hr=8004010f
14:49:03] DEBUG, Attempting to login to mailbox: USERAME3
14:49:03] DEBUG, Logged on to mailbox: USERAME3
14:49:03] ERROR, Could not open mailbox root folder, hr=8004010f
14:49:03] DEBUG, Attempting to login to mailbox: USERAME4
14:49:04] DEBUG, Logged on to mailbox: USERAME4
14:49:04] ERROR, Could not open mailbox root folder, hr=8004010f
14:49:04] DEBUG, Attempting to login to mailbox: USERAME5
14:49:04] DEBUG, Logged on to mailbox: USERAME5
14:49:04] ERROR, Could not open mailbox root folder, hr=8004010f
14:49:04] DEBUG, Public Folder Path: E:\MDaemon\Public Folders\
14:49:04] DEBUG, Opened Exchange public store
14:49:04] DEBUG, Opened Exchange public folders
14:49:04] DEBUG, Begin - RecursePublicFolders
14:49:04] INFO, Public Folder: Archived Emails already exists, skipping
14:49:04] INFO, Public Folder: Internet Newsgroups already exists, skipping
14:49:04] DEBUG, OpenEntry failed, hr=80040115
14:49:04] DEBUG, Container Class: IPF.Contact
14:49:04] DEBUG, OpenEntry failed, hr=80040115
14:49:04] DEBUG, End - RecursePublicFolders
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I have done ALL the setup requirements as outlined in the KB: "Migrating from Microsoft Exchange to MDaemon"
Including, Add-ADPermission -identity 'MyMailBoxDataBase 12345678' -user 'ADomainAdminAccount' -ExtendedRights Receive-As
And have checked in the EAC to make sure both the accounts I tried had "Manage Full Access Permission" to the five (really all) Exchange User Accounts. Any suggestions on getting past this and on to other Testing?

Outlook connections are done using Negotiate Auth & HTTP Proxy - all standard MS Exchange stuff.

I did want to congratulate your team on how easy it was to get Active Directory communication working [with NTLM being fully blocked in Local/Group Policy] AND the ease of getting a 3rd party Certificate in place [Using the KB: "How to create a CSR and imp