"Access Denied" error message when you try to grant Send on Behalf permissions to a user for the mailbox of another user

When you try to grant the Send on behalf permissions to a user for the mailbox of another user in Microsoft Exchange 2000 Server, you may receive the following error message:

This problem may occur if you are logged on as an Exchange administrator with the following delegated permissions to the user account mailbox that you want to grant this permission to:

Cumulative Rollup Information

To resolve this problem, obtain the September 2003 Exchange 2000 Server Post-Service Pack 3 (SP3) Rollup. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Hotfix Information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Exchange 2000 Server service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The global version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Date         Time   Version            Size    File name
-----------------------------------------------------------
30-Jan-2003  20:14  6.0.6409.0         69,632  Ccmproxy.dll 
30-Jan-2003  20:13  6.0.6409.0      8,462,336  Exadmin.dll 
30-Jan-2003  20:14  6.0.6409.0         73,728  Inproxy.dll
30-Jan-2003  20:14  6.0.6409.0      2,969,600  Mad.exe
30-Jan-2003  20:13  6.0.6409.0      4,648,960  Maildsmx.dll
30-Jan-2003  20:15  6.0.6409.0         77,824  Pcproxy.dll     
01-Aug-2002  06:37  6.0.6300.1         84,480  Spuninst.exe     
30-Jan-2003  20:15  6.0.6409.0         94,208  X400prox.dll      

Note Because of file dependencies, this update requires Exchange 2000 Server Service Pack 3 (SP3). For more information, click the following article number to view the article in the Microsoft Knowledge Base:

To work around this problem, allow the following permissions to the Exchange administrator account, on each of the user mailboxes to which you want to allow the Exchange administrator to grant Send on behalf permissions:

Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server.

With this update you can allow a delegate Exchange administrator the permission to assign Send on behalf permissions to mailboxes, without having to allow them the additional permissions of assigning different recipients.