This has probably already been asked, but I am unable to find it
We are using a cloud email provider currently, running exchange 2013. we are planning to migrate to Office 365 Exchange Plan.
I am absolutely fine with the migration plan, however previously when deleting a user on our internal active directly, and the corresponding cloud mailbox, when re creating the same user a few months later everyone had to delete that user from their cache settings in Outlook to be able to email her again!.
I am therefore concerned that anyone with our cached details for any of our employees will no longer be able to email us post migration, and will need to re enter the email address from scratch.
From what I’ve read it appears to be an “internal” issue only, but I want to check this.