pst migration challenge - calendars

somnio 1 Reputation point

Hi all,
I need a quick sanity check on something if I may

I have just started an engagement with a client who have already 'begun' their migration to the cloud and realised they need help... (familiar to many?)

They have exported their mailboxes to pst files and now want to import them into ExO..... long story short - the last person involved has found employment elsewhere.

I am having a conversation about the pain they are going to face around calendars... has anyone found a tool or PS script that 'reconnects' meetings?

thanks all

PS - please, there is no need to say how bad/wrong/how it should have been done etc I think we all know that answer.

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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  1. Andy David - MVP 143.7K Reputation points MVP

    I've never tried this, but I wonder if you import everything but the calendar, then copy the calendar into the mailbox, if that would work.

    The other issue is the legacyExchangeDN. If the mailboxes were moved using a hybrid scenario, then it will be preserved. If they were created clean in ExO, then you would need to add the old LegacyExchangeDN of each mailbox as a X500 address to the new mailboxes in Exo

  2. Eric Yin-MSFT 4,386 Reputation points

    How is your environment deployed? On-premise or Hybrid?
    Have the mailboxes been migrated to Exchange Online without calendar data? Was the process failed or what?
    The official method: Use network upload to import your organization's PST files to Microsoft 365
    The command New-MailboxImportRequest is not supported in Exchange online, and we wouldn't recommend any third-party tools because they may not be safe. If you insist on them, some tools metioned here should be better: Third-party migration

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