Closing Exchange service, how to keep all calendar and mail data?

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My boss has decided to finish our hosted Exchange service, against my advice. It means we won't be able to have sychronised mail and calendars any more.

To protect our data from loss, and import it into a new Outlook profile, what do I need to do?

I have the OST file but what would I do with that?

I know I can drag the mail folders from the Exchange mailbox to a new Imap mail box but that doesn't resolve the calendar issue.

Please can someone suggest a way to do this transition without losing data? I am most concerned about the two calendars for each mailbox.

Thanks in advance for advice

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