Office 365 Mailbox Import

[HereIGoAgain2601]

Hi,

 

I am trying to upload some mailboxes I have received from an outgoing IT provider that need uploading into a trust's office 365 platform. This has been plain sailing previously but I'm guessing these mailboxes are in a different format. I am using Security and Compliance, the mapping file is valid and the PST files have been uploaded.

 

We are getting an error message that we need a primary and archive mailbox for the users.

 

Anybody seen this before? The users are AD synced. I have tried turning on archiving for a couple, but doesn't seem to have helped.

 

Thanks

[MatthewL]

Can you open the PST in Outlook ok?