XCLN: "MAPI_E_TABLE_TOO_BIG" Error Message Is Returned by the GetMailboxTable Function When Exchange 2000 Hosts More Than 65,535 Mailboxes

When you use a MAPI-based program that calls the GetMailboxTable function, you may receive the following error message:

This problem may occur if the Microsoft Exchange 2000 Server computer that you are running the MAPI-based program on hosts more than 65,535 mailboxes. The problem occurs because MAPI has a limit of 65,536 entries or 64 kilobytes (KB) in a MAPI table.

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language. The English version of this hotfix has the file attributes (or later) 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. Note Because of file dependencies, this update requires Microsoft Exchange 2000 Server Service Pack 3 (SP3). For additional information, click the following article number to view the article in the Microsoft Knowledge Base: After you install this hotfix, you must also add the GetMailboxTable skip value registry entry. To do this, follow these steps.

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

1. Click Start, click Run, type regedit.exe, and then click OK.
2. Locate and then click the following key in the registry:
   HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange\MSExchangeAdmin
3. On the Edit menu, point to New, and then click DWORD Value.
4. Type GetMailboxTable skip value, and then press ENTER.
5. On the Edit menu, click Modify.
6. In the Base area, click Decimal, and then type the value that you want to use in the Value data box.
   
   Type1 if you want the GetMailboxTable function to obtain the first 65,536 entries. Type 65,536 if you want the GetMailboxTable function to obtain higher-numbered entries; the information that is returned starts with entry 65,537.
7. Quit Registry Editor.

Note To obtain one set of entries after you obtain the other set, you must change the value in the Value data box (see step 6), and then you must call the GetMailboxTable function again.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.