XADM: Public Folder Slowness in Folders with Thousands of Messages |
The information in this article applies to:
-
Microsoft Exchange Server, version 5.5
SYMPTOMS
The creation, modification, and deletion of messages in public folders that
have many thousands of messages may appear slow.
CAUSE
The Exchange Server information store maintains data for every client
regarding the read or unread status of every message. This per-user
read/unread processing can cause operations to appear slow when the number
of messages in the public folder is very large.
WORKAROUND
To work around this problem, create a hierarchy of folders to distribute
the messages so that fewer messages are in each folder.
STATUS
Microsoft recognizes the need for disabling per-user read/unread processing
for specific folders in certain circumstances. We have modified Microsoft
Exchange Server 5.5 so that it is possible to programmatically disable this
processing on a particular folder.
To obtain this feature, obtain the latest service pack for Exchange Server
version 5.5. For more information, please see the following article in the
Microsoft Knowledge Base:
Q191014
XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack
The English version of this feature should have the following file
attributes or later:
Component: STORE
File Name Version
-----------------------
STORE.EXE 5.5.2435.0
MDBMSG.DLL 5.5.2435.0
GAPI32.DLL 5.5.2435.0
This feature was first included in Exchange Server 5.5 Service Pack 2.
MORE INFORMATION
Disabling per-user read/unread processing for a folder causes the state
of read/unread properties to become inconsistent for objects in the folder.
This inconsistency may cause confusion among users who expect that they can
influence the read/unread state of a message.
To disable per-user read/unread processing for a public folder, a new
MAPI folder property has been created. The new property has the following
definition and will eventually be added to the EDKMDB.H header file
included in the Microsoft Platform SDK. Until such time, you must add the
property definition manually in your source code.
#define PR_DISABLE_PERUSER_READ PROP_TAG( PT_BOOLEAN, 0x66c5)
Set this property to a non-zero value (TRUE) on the public folder for which
you want to modify per-user read/unread processing.
Additional query words:
sluggish many millions
Keywords : exc55sp2fea XADM
Version : WINDOWS:5.5
Platform : winnt
Issue type : kbprb
