On Mon, Feb 22, 2010 at 4:27 PM, Tom Limoncelli <[email protected]> wrote:

> On Mon, Feb 22, 2010 at 3:35 PM, Nick Whalen
> <[email protected]> wrote:
> > Tom Limoncelli wrote:
> >> One point of concern:  Can you Exchange server handle the very large
> >> mail boxes that people may have accumulated on the Google Apps
> >> accounts?   If you run out of space on Exchange it could make for some
> >> unhappy users (and sysadmins).  You might want to migrate only
> >> designated folders, or not migrate any data, just have new email go to
> >> their Exchange inbox and let them retain their Google Apps account for
> >> a year.
> >>
> > This is definitely a point of concern, both for me and the Ops group.
> > The Exchange server sounds like it's old, and wheezy, so I'm concerned
> > about large IMAP copies bringing the thing to its knees. I'm not sure
> > what mailbox database storage pool looks like, information is still
> > feeding into me atm. Unfortunately most of my users are not very
> > technically inclined and as a result deem all their e-mail 'critical'
> > (And I don't have time to help 25 people sort through 1-7GB of mail
> > per-box :)). Selective moves aren't much of an option in this case I'm
> > afraid.
>
> Do the math, see how much disk space they'll need, and ask them to
> provide it.  (better yet, provide a spreadsheet with username and
> mailbox size).  They want the conversion, they should understand what
> they've asked for.
>
> Tom
>


Seems that most replies have missed this piece of information from the
original message:
    Methods that would produce a PST file of the
    GMail mailboxes would also be heartily welcomed, as
    it would appear Ops would like to keep the old mail
    off of the Exchange storage group and on the local user's machine.

It's always a good idea to know you're requirements, but in this case the
disk on the Exchange server is not an issue.

For a migration like this, you need to do everything wholesale.  Move all
messages to the new solution and cut ties to the previous one.  It would
create more headaches and user confusion later on if some mail is left at
gmail and other mail is on exchange.
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