Migration to Office 365 from Linux mail server


One of my client want to migrate from "Linux Mail Server packaged BOX" to Office 365.
I'm OK with the migration of mail content (via IMAP / Supported by Microsoft).

My question is for Calendar & Contacts migration. Do you know how to do the import of this data on O365 (process or with a software) ?

Some information :
- Only webmail access to the source mail server (Linux)
- No Outlook installed on computers : users will only use OWA on O365
- Old server can only be accessed via IMAP
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Benjamin MOREAUProject ManagerAsked:
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Vasil Michev (MVP)Commented:
There is no way to import data in Office 365 mailbox directly via PST, like in normal Exchange. So, the import is done  via the Outlook client instead. Perhaps you should take a look at the Connected accounts feature: https://support.office.com/en-au/article/Connect-to-another-email-account-174da61d-2c8d-4b62-bf4f-8c1dd06a97cf

Another option is EWS. If you can get the calendar items exported as CSV file, you can use EWS based scripts to import them in O365 mailboxes. We've discussed this here: http://www.experts-exchange.com/Software/Office_Productivity/Office_Suites/MS_Office/Microsoft_Office_365/Q_28622023.html

Same is possible for Contacts.
Benjamin MOREAUProject ManagerAuthor Commented:
It's ok when using Import-CalendarCSV.ps1.

Unfortunately, it's not easy to convert ICS Calendar from specific mail server to a good CSV file... In 90 % of ICS to CSV convertion, we have a lot of errors (bad CSV lines, etc...).
Benjamin MOREAUProject ManagerAuthor Commented:
Thanks Vasil, it's a partial to import ICS cal to Office 365.

I don't found any good solution to convert ICS to CSV...
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