I have the following problem:
By migrating a user from the databese EX2010 to EX2013 via the Exchange Admin Center a second user/duplicate is getting created and the original mailbox/isn't accessible anymore. The mails can still be found by logging in with the duplicate user.
It seems like there is a workaround for that problem for an older Exchange version. https://blogs.msdn.microsoft.com/ashour/2015/08/28/fix-duplication-in-default-folders-kb3031133-kb3069501-kb2991934/
Why is that exact problem still happening with the current version I'm working with (Exchange CU19) and can I somehow solve that without deleting all duplicates after a migration of alls users?
Thank you