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somnio-5429 avatar image
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somnio-5429 asked ·

pst migration challenge - calendars

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.

office-exchange-server-administrationoffice-exchange-hybrid-itpro
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AndyDavid avatar image
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AndyDavid answered ·

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.
https://www.slipstick.com/outlook/calendar/move-meetings-losing-ability-send-update/

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

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will test the impact & success

Thanks Andy :)

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EricYin-MSFT avatar image
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EricYin-MSFT answered ·

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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Hi Eric,
It's a divestment, or 'divorce', as both organisations are calling it.... bodes well for the project do you think!

no connectivity in any way shape or form between the new divestment tenant & legacy estate. The on-premise exchange estate owners are 'adamant' there will be no form trust for federation to do a remote move to a temporary new exchange build.
Budgets are tight so 3rd party tools are rules out.... sleeves up and prepare to weather the storm which wasn't well received on the call last night when it was all explained.

What would be awesome would be a funky PS script by those clever folk in the product group etc that allow meetings to be linked post .pst migration.

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OK, how is it going with Andy's solution?

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