Outlook PST size limitation

I am very familiar with the 2GB Outlook PST size limitation but in googling I am finding that outlook 2003 and above supports upto 20GB.
Is this realistically stable? or is it just a threoretical limit?

Thanks.
ie0Asked:
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K_WilkeCommented:
It is realistic with a caveat.
It can be that big, but the number of items in the inbox (not counting subdirectories), sent items, and the deleted items directory must each be under 2,000 items or there will be some type of weird corruption.
I have had clients that used this rule of thumb and their pst files got up to 15-18 gig.
Thanks,
Kelly W.
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JRasterCommented:
I have had customers with 4 to 8 GB PST files with no issues.  
Never pushed the 20GB limit though.  
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Alan HardistyCo-OwnerCommented:
Outlook 2010 introduces a 50Gb PST limit:

http://support.microsoft.com/kb/982577

Not seen one that big before, but I have seen some closer to the 20Gb limit.  You would be amazed at what people want to keep!
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