Introducing MessageStats Gathering Reports
The MessageStats Gathering node contains reports with an administrative view of the MessageStats database and are not based on any Exchange server data.
These reports provide information on the gathering history of Exchange servers including summary information, status of gatherings, and gathering failures.
MessageStats Gathering Report Descriptions
The MessageStats Gathering report folder contain reports that describe the status of the various MessageStats gathering tasks.
Appendix A: How to Read the Reports
What is the Definition of Physical and Logical Messages?
MessageStats reports show the message values in two categories: logical and physical. In the report column headings, the term physical identifies the physical message counts. If messages are not labeled as physical, they are logical messages.
For example, in the Mailbox Activity | Summary report, the message columns are labeled as Physical Messages. The term physical message is used to provide message counts in a manner similar to how Exchange handles a message. When a user opens Outlook, creates a message with five recipients and clicks Send, there is one physical message that Exchange tries deliver to each recipient.
Exchange may create copies of the message so that each recipient can receive the message. This process is called bifurcation and is performed when different recipients receive copies of the same message. A logical message is a message in which each recipient is counted as a separate message. For example, if a mail message is created in Outlook and is sent to nine recipients, MessageStats would count that as one physical sent message and nine logical sent messages. From a delivery standpoint (received messages), the logical and physical counts are the same since a delivery event can only happen to one mailbox.
Logical message counts make more sense when you categorize messages as internal or external. For example, in the Mailbox Activity | Internal vs. External report, MessageStats needs to determine whether a mailbox is sending internal or external messages. Since a message can have multiple recipients, and the recipients can be both internal and external, reports need to show a message in more granular way.
For information about internal and external messages, see How Does MessageStats Determine Internal and External Messages? .