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Outlook mail is delivered to wong internal mailbox while OWA delivers fine

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Last Modified: 2018-10-04
Hi Experts
I am stuck on a problem with outlook sending to wrong internal mail address.

Mail environment is Office 365/Exchange online
On a shared mailbox I deleted a mail alias and added the same mail alias to another user's mailbox.

Before:
shared mailbox: abc@abc.com
User mailbox: def@def.com

after:
shared mailbox: abc_old@abc.com
User mailbox: renamed from def@def.com to abc@abc.com

The problem is that when I send an email from outlook 2016 to abc@abc.com it is delivered to abc_old@abc.com
But if I send send the email from webmail it is delivered correctly to abc@abc.com

And email from my colleague end up in the same wrong mailbox, so the problem is not local to my outlook 2016.
I am thinking that there is something in outlook that is not updating correctly.
Thanks
atb Anker
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Commented:
Thanks for the comment.
It appears that outlook was very slow to update it own auto-completion or what ever it was.

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