With the grain of salt that this is written by a company that makes a forensic email collection tool, I think reasons 2-6 in the linked list are very real issues for any eDiscovery collection, and why I would not rush into collecting any web-based email account.
“On the surface, this looks reasonable—Outlook connects to email servers, downloads messages and saves them in PST format which is easily ingestible by eDiscovery and computer forensics tools. That said, Outlook is not your best choice to make a forensic copy of a mailbox. Here are 7 reasons why:”
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