Exchange 2010 Second Mailbox vs Archive Mailbox

Are there any differences between a user having a 2nd mailbox with Full Access permissions vs having an Archive Mailbox?

Obviously the administrative overhead required for deploying and managing a 2nd mailbox compared to an Archive mailbox, but what are some other cons of this?

It seems to me that it is possible to accomplish everything with a second mailbox, instead of an archive mailbox.

Appreciate any and all input.

PS. We're looking at this as an alternative to implementing delete retention policies, which also apply to an archive mailbox.  If we have a 2nd mailbox, and have retention policies in place to delete after # of days, users wanting to keep mail could move it to their 2nd mailbox.
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
You don't need a licence for the second mailbox.
The underlying functionality is the same. You will need a second AD account and you don't get anything automated to get the content in to the second mailbox.
I have clients who are doing exactly what you have outlined, with no problems at all. The second mailbox is converted in to a Shared Mailbox using EMS after creation and they usually have adopted some kind of naming convention.

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