I´ve some mail account on premise exchange which I´like to migrate to exchange online. At this point.. easy.
I choose one email account, mine, and
-create the same account at exchange online.
-validate the domain
And now, I have inserted a 0 MX record at DNS. There are two records, 0 value for office 365 and 10 for my existing enviroment. The problem is when I send an email to an email account which is only defined at on premise server.. an error is reported.
How to accomplish this movement without broking the service for non migrated accounts?