Don't want to lose email in the external spam queue - best approach to this.

What is the best way to assure email is not lost or becomes hard to get to after changing from on-site exchange to Ofice 365? Specifically concerned with the email in the spam filter which is hosted offsite, the other email is recovered from the EDB into pst format and will migrate this way. After removing the on-site server and moving EDB data into PST format external emails have been accumulating in the offsite spam filter (Proofpoint). I'm about to switch over the DNS and route email to Office 365 for the domain, should I reroute the spam filter to the new Office 365, I believe this is the best way to move forward, however, doesn't hurt to discuss.
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WORKS2011Austin Tech CompanyAsked:
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Schnell SolutionsSystems Infrastructure EngineerCommented:
Hey, why not going with the hybrid or stage migration?

In case that you cannot go neither with hybrid or stage... like you say... you can validate in domain in O365, create your mailbox accounts there and then point your antispam application to move the messages there.

After that you can work with your data migration operations, the change of the MX records to O365 and so on.
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timgreen7077Exchange EngineerCommented:
Specifically concerned with the email in the spam filter which is hosted offsite

Normally if you are using a host site for spam filtering, if they can't communicate with your mail server they queue up the messages for so many days so that you will not loose any mail. You will have to talk to your provider about how many days they will queue up your messages. If there is mail in the spam filters or quarantine, your move to O365 will not prevent you from accessing that mail, but like @schnell Solutions mentioned point your hosted provider spam filters to your O365 tenant so that they will continue to deliver the mail without interruption.
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timgreen7077Exchange EngineerCommented:
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