Converting a user mailbox to shared mailboc

Will I lose the archive on a user's mailbox if I convert the mailbox to a shared mailbox?
This is in a hybrid Office 365 environment.
What is the safest way to do this conversion?
Is there anything I need to be mindful of when doing the conversion?
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Éric MoreauSenior .Net ConsultantCommented:
I have converted regular mailboxes to shared (when employees are leaving for example) and never lost any messages.

I am not in an hybrid setup but I don't see what it could change.
timgreen7077Exchange EngineerCommented:
Eric is correct, you will not loose anything. shared mailboxes can also have archives so there will be no change. you are safe to do the conversion. just be sure not to remove the mailbox and recreate it. just do the conversion and you will be ok.
Juan OcasioApplication DeveloperCommented:
We do this all of the time at my office, esp when we need to share a termed user's mailbox with several people.  We would convert the mailbox to a shared mailbox and then give rights (including send as) to various users.
Vasil Michev (MVP)Commented:
Shared mailboxes require a license if you are going to use the Online Archive, as stated in the service description:

To access a shared mailbox, a user must have an Exchange Online license. Shared mailboxes don’t require a separate license. However, if you want to enable In-Place Archive or put an In-Place Hold or a Litigation Hold on a shared mailbox, then an Exchange Online Plan 2 license or an Exchange Online Plan 1 with Exchange Online Archiving license is required. If you enable In-Place Archive and auto-expanding archiving for a shared mailbox, additional storage is automatically added when the 100 GB storage capacity for the archive mailbox is reached.

So you might as well keep it as user mailbox.

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DonKwizoteAuthor Commented:
Thanks Everyone!
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