Hi Anna and Ronny,
Thanks for your information. I deleted all the Exchange365 users/mailboxes and setup Cutover migration. Almost everything synced well :-)
Only thing to do for me is during the final migration:
- change all passwords for all the users that were created by Cutover migration, these are to difficult now ( I can do that already)
- add licenses to users (I can do that already)
- remove unwanted/unused/disabled mailboxes
- convert some user mailboxes to shared mailboxes (info, sales, etc) due to license
Thanks,
Steven