Large Exchange Mailbox causing lots of problems

Hello Experts,

I have a user that has a mailbox that is 87GB (the CEO) as a result of the mailbox size he is now having all kinds of difficulties accessing this mailbox from various email clients.

We are currently running exchange 2007 and are looking to deploy exchange 2013 to enable email archives. From this point we wish to to archive his old emails and free up as much space as possible.

Does this sounds like the best way to proceed or does anyone have any other recommendations?
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pcesolutionsAsked:
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willaienCommented:
From an outlook client, you can run an archive there. This will push all emails of specified age to a new archive data file. They will be inaccessible from anything but that machine/client, however.
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Nick RhodeIT DirectorCommented:
Run an archive to his local system mainly to reduce spending your weekend just moving it into exchange 2013.

http://www.youtube.com/watch?v=HCjN1x86n74 

You can them move it later or to his user share and open it until you get the archive feature setup.
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pcesolutionsAuthor Commented:
Thanks for all the advice guys, unfortunately it appears that the max mailbox size it can store is 50GB and as a result I can't get it to cache the full 80GB. I have tried increasing the max size through the registry as per this guide http://www.msoutlook.info/question/99 but the PST reg key is not even present. Also when attempting to archive old emails it moved about 400MB worth then stopped.
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pcesolutionsAuthor Commented:
Ok so I managed to export much of the data to archive, yet the mailbox size has not changed on the exchange server. I suspect that I need to compact it, is this done on the exchange server or from the Outlook client?
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willaienCommented:
Look up how to defrag an exchange database.
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pcesolutionsAuthor Commented:
I don't want to defrag an exchange database, its just for one users' mailbox.
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willaienCommented:
Its how you get Exchange to compact the database.
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pcesolutionsAuthor Commented:
Is there not a way to compact just one mailbox? or does Outlooks' built-in compact function only compact the .OST and not the mailbox on the Exchange server?
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willaienCommented:
Outlook's compact features only compact the local files. In order to compact an exchange database, you must compact the entire thing. You can do so by defragmenting the database.
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pcesolutionsAuthor Commented:
I was afraid of that.... But shouldn't exporting old item to .PST automatically reduce the size of the exchange mailbox?
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willaienCommented:
The mailbox, yes. If you have it only locally.

However, the whole database will not shrink until you do a defragment on the database.
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