Cutover migration from Exchange2010 to O365 failing

Dear experts,
I would like to get some advice to solve a major issue I am encountering while trying to perform a Cutover migration from my On-premise Exchange 2010 to my O365 Organisational Account.
We have been using Lync Online and Sharepoint Online for a few months now, and it has been decided to move our Mailboxes as well. Our users have been provisioned with DirSync. According to the MS doc, you have to disable DirSync before performing a Cutover Migration, which I did successfully.
After creating my endpoint and starting my migration batch, I get this error : "A different type of Active Directory object already exists".
According to this KB ( http://support.microsoft.com/kb/2968722 ), I need to delete first all of my users then restart the migration, which seems rather drastic. Our users have already been using Lync and Sharepoint for a while now, deleting and recreating their accounts (which could take a while depending on the migration speed) is a solution I would like to avoid as much as possible, as you can imagine. If there are any workaround, I would love to hear it !
Thanks a lot,
LVL 2
maxalarieAsked:
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AmitIT ArchitectCommented:
In this case, you already have account in O365, so you can avoid this step. You only need to move mailbox to O365. I suggest to move a test mailbox first.
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Vasil Michev (MVP)Commented:
The cutover migration process has it's own account provisioning, if you have the users already created, better go with staged migration. Or you can even go with Hybrid and mailbox moves, though it will require a bit more setup on your end.
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