Office 365 Migration question

A company has a third party to host their emails on the 3rd party exchange 2010. All the users of this company is able to access emails using regular OWA and outlook. This company wanted to migrate all its users to office 365 as they have the credentials to control MX records. The third party has limitations in creating migration endpoints and IMAP all access has to happen using the Outlook anywhere.

The question here is without migration endpoint or IMAP having only the end users credentials is there a possibility of office 365 migration?
Joe FrixonBusiness OwnerAsked:
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Vasil Michev (MVP)Commented:
PST export/import or 3rd party tools...
without access to the sever you will need to complete the task the hard way (import export) i would setup the new 365 infrastructure first and create all related user accounts. Ensure all DNS records are resolving correct.

48 hours before the migration reduce the TTL on the MX records, Migrate the MX records to the 365 infrastructure and complete some test mails to ensure the new domain is working (you may need to clear outlook cache for it to go to the new 365 infrastructure) once complete and tested export all users accounts via outlook (be sure no emails are dropping in via the old MX record) and store secure. Create new profiles for all users and ensure Autodiscover is now working as expected (connecting to 365 without issue). Connect all new user profiles to 365 and test mail flow internally and externally. Attached previous PST archives to outlook and then Drag/Drop within outlook to the new Inbox.

Sit back have a few Cups of Tea and wait, log into the users Webmail in 365 as proof that emails are syncing. Repeat for all other users (you may want to take an archive copy of all PST files in case some are lost/dropped.

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