Which mailbox storage indicator is correct?

When I right click on my mailbox in my outlook 2010 client and go to properties and folder size, i see local data total size at 133490 KB and server data total size as 145152KB. However, when I open ESM on our server (SBS 2k3) and go to Administrative groups --> Servers -->  SAMSSERVER --> First Storage Group --> Mailbox Store -->  Mailboxes and find my name in the list, i see a mailbox size of 367291KB.  Which source is more accurate? Also, which source should I trust when I have to increase mailbox sizes due to users getting limit reached messages from outlook?

Thanks.
clloccAsked:
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Cliff GaliherConnect With a Mentor Commented:
Trust the server. Due to the way Exchange stores information and indexes, what Outlook sees and what Exchange is actually using can be vastly different. Since Exchange enforces policies, it is the data that matters in this instance.

-Cliff
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