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RE: Mailbox total items mismatch

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RE: Mailbox total items mismatch - 26.Nov.2008 8:03:04 AM   


Posts: 12
Joined: 17.Nov.2008
Status: offline
Good stuff!!

I will check those things and let you know.


(in reply to uemurad)
Post #: 21
RE: Mailbox total items mismatch - 9.Dec.2008 7:10:47 AM   


Posts: 154
Joined: 29.Jul.2008
Status: offline
Seems like this post will clear all doubts with this query:
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 appear to be different until the Information Store Integrity Checker (Isinteg) is run to correct the item count issues. In general, if you are attempting to understand an item count or size issue, ensure you are running the latest version of the Microsoft Exchange Information Store service, and you have run Isinteg after applying the fix.
Its not something which I say:
This Technet article describes how to determine the True Amount of Space in an Exchange Database. And Why ESM and Outlook show Different Sizes for the Same Mailbox.


Ratish Sekharan Nair

(in reply to jigsaw2026)
Post #: 22

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