If you try to import PST files (via network upload) into Exchange Online and get the following error in the Office 365 Security & Compliance
Category: Exchange
Mailbox migration failure: the source email address couldn’t be found in the on-premises domain.
Issue A mailbox failed to be migrated to Exchange Online with the following error: SourceRecipientDoesNotExistException: The source email address test.user2@x500.co.uk couldn’t be found in the
Converting User Mailboxes to Shared Mailboxes
Mailboxes can be converted from user mailboxes to shared mailboxes via the following PowerShell command: Set-Mailbox SteveTest1@x500 -Type Shared The following attributes are changed. [Exchange
Exchange Online Staged Migration: Shared Mailboxes
Issue When shared mailboxes are migrated from Exchange 2007 to Exchange Online via cutover or staged migration methods, they are created as user mailboxes in Exchange
Mailbox migration failure: the provided email address was not unique on the source side.
Issue A mailbox failed to be migrated to Exchange Online with the following error: SourceEmailAddressNotUniquePermanentExeption: The provided email address “test.user1@x500.co.uk” was not unique on the
Exchange 2007 to Office 365 Staged Migration – convert Mailbox to MEU
Overview In an Exchange 2007 to Office 365 Staged Migration, when a mailbox has been successfully migrated to Exchange Online, it is necessary to convert
