Difference between shared mailbox from scratch and converting a user mailbox to a shared mailbox

Indie101
Indie101 used Ask the Experts™
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Difference between creating a shared mailbox in Exchange 2013 Hybrid and converting a user mailbox to a shared mailbox

Converting a user mailbox to a shared mailbox and users can't access it, they have full access any ideas
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Exchange Engineer
Distinguished Expert 2018
Commented:
First a shared mailbox is a normal mailbox associated with a disabled AD user object. A user mailbox is a normal mailbox associated with an  enabled AD user object.

If you convert a user mailbox to a shared mailbox the only thing that happens is the AD user object becomes disabled but the mailbox, permissions and content remains the same, so basically the only difference in essence is the status of the AD user object associated with the mailbox, one is a disabled object (shared), and the other is an enabled object (normal). If you convert a user mailbox to a shared mailbox all user with full access to that mailbox retains that access.

You can review the below link if you still have questions:

https://social.technet.microsoft.com/Forums/ie/en-US/e62271f9-7e1c-4579-8e7d-6bf3c64a280b/shared-vs-user-mailbox?forum=exchange2010
MichelangeloSystem Administrator / Postmaster

Commented:
converting a mailbox From user to Shared Won't make a difference if Done properly when the mailbox is on cloud  (set-mailbox on cloud ; change remote recipient type on prem )
however , delegates access won't work in any case  unless you perform The aclable change on prem.

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