Why Do Exchange System Manager and Outlook Show Different Sizes for the Same Mailbox?
When a calculation is performed for a size of a mailbox, consider the following: • Microsoft Outlook® takes into account only what a user can see from the mailbox, so only items that a user can see from the Outlook client in the mailbox folders are calculated. • Within a mailbox, many hidden items exist. Some of these items include third-party hidden folders, rules, and items used to support the functionality included with an Exchange mailbox. These hidden items are sometimes referred to as NON_IPM_DATA. Exchange System Manager considers all related mailbox data, including NON_IPM_DATA when calculating the size of a mailbox. This implies that the size of the mailbox is usually bigger when viewing it from Exchange System Manager, rather than viewing it from Outlook client. There are also several bugs related to size calculations that may be a factor in understanding these discrepancies. If you incur this problem and subsequently apply a fix to correct the problem, the size counts may ap
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