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sglee

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Outlook Oversized OST File Problem

Hi,
 I have an Outlook 2010 user (whose mailbox size is over 50GB) on Exchange 2010. He uses Outlook 2010 in "cached mode".
 Today there was an error about OST size.  I checked the size of OST file and it was very close to 50GB.
 I understand that maximum size of OST or PST on Outlook 2010 is 50GB.
 For now I disabled "Cached mode" in Outlook 2010. But I prefer to run Outlook in Cache mode just in case Exchange Server is not available, at least the user would have access to all previous emails & folders.
 So what is the best solution here?
(1) Simply disable Cache mode or
(2) Change registry value "somehow" to allow OST file size bigger than 50GB if that is possible?

Thanks.
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sglee

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Thanks for the suggestions. The consensus seems to be against going over 50GB in OST file in Cached mode.
Has anyone maintained OST file >  50GB?
How slow they become?
Other than slower performance in Outlook, what else could go wrong or what else the user would notice?
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