Problem migrating Office 365 Mailbox with 99,500+ contacts

I have an end user with 99,500+ contacts including the Recipient Cache.  We're doing an O365 Tenant to Tenant migration.  Every time I try to do a full mailbox migration it stalls with this warning: "The server cannot service this request right now. Try again later. Waiting 5.00 minutes before resuming".  It'll keep saying that forever.  I have a support case open, but I'm trying this avenue as well.  Support asked if there is a folder with a lot of items.  99,500 items is a lot, but we had many other users with many more mail items, and there were no issues with their mailboxes.  I was able to migrate everything else in this mailbox by excluding contacts.  This issue only happens when I try to migrate contacts.  Working on support's theory of too many items in a folder, I split the Contacts folder into sub folders with 23,649 or fewer contacts each (a very tedious process manually using Outlook).  I till keep getting the same "The server cannot service this request right now. Try again later. Waiting 5.00 minutes before resuming" issue.  I could keep splitting contacts into more folders, but I have a feeling that Quest tries to get a total Contact count from all folders and then runs into this issue.  Running "Get-MailboxFolderStatistics username@domain.com -folderscope contacts | select identity, itemsinfolder" returns the count across all folders almost instantly.

Thoughts?  Am I going to have to resort to using Outlook to export these to a PST, and then re-import them?  That'll be disappointing.

Thanks.

-Alex

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