Backup of Exchange 2007 Mailboxes - Prior to decommissioning

We have a client with approximately 1000 mailboxes on our Exchange 2007 server.
They have just completed a migration of said mailboxes to Office 365.
They would like a backup of what we currently have on our Exchange 2007 server.

Q: They would like me to recommend a method for the backup and how they will be able to recover a mailbox in the future (should they need it).

What should I recommend?

I am familiar with using Powershell to Export mailboxes in bulk to a PST (in fact I tested it on 10 mailboxes and it does work fine).
But it seems a tad slow.
Is there something better than that?

Thank you for your time.

K BAsked:
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What os is the system running on! When they envision accessing the data in the future, what are they thinking if using.,  that will dictate the method.  You can backup the exchange using ntbackup or a backup software, but exchange will need to be present/available at the time.

Virtualizing with a 1000 mailbox could be a bit much.

Presumably part of the transition to o365, the data from all active mailboxes was transferred up.

The options need to take into account what might be available at the time access might be attempted.
K BAuthor Commented:
I believe the OS is 2008 or 2008r2 x64.
Thanks for your reply!

I believe "no exchange server" would be available to them. Virtualizing?
Yes all new mail is pointed to 365 however they only want what we have backed up.
With that said, am I only limited to the export-mailbox, export-to-pst method? Or?
Miguel Angel Perez MuñozCommented:
I suggest you export all mailboxes to pst, then import on Office 365 using pst capture:
mac carterCommented:
Refer to given links might be they helps you to accomplish this task:

Exchange backups on Windows Server 2008:

The Right Way to Perform a Backup in Exchange Server 2007:

Backup and Remove Mailboxes from Exchange 2007 SP1:
If the current server is not preserved through virtualization and no exchange will be available in the future and with that restoring a 2007 mailbox might not be accessible, your option is to export it into pst(s) and then possibly convert the pst into ... A non proprietary format.
I think the office365 handle the migration of existing data.

Not sure why slowness is an issue unless you have a timeframe by which the exchange server must be shutoff or the server is in fear of going down.

The problem with pst is a question on how to preserve/convey the backups in whatever format through the years.

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