This article was previously published under Q216796
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NOTE: The procedures in this article only apply if you have installed Outlook with the Corporate or Workgroup option. With this option, you can use Messaging Application Programming Interface (MAPI) services. To determine your installation type, click About Microsoft Outlook on the Help menu. If you have the Corporate or Workgroup installation, you see "Corporate or Workgroup". WARNING:This information is preliminary and has not been confirmed or tested by Microsoft. Use only with discretion.
When you attempt to start Outlook, you may receive the followingerror message
The MAPI Spooler could not be started. Close and then restart all mail-enabled applications MAPI 1.0 (000004c7)
followed by the message:
Unable to open the Outlook window.
There are two possible causes for this problem:
Missing or Damaged File
A missing Mapisp32.exe file can cause this problem. The Mapisp32.exe file mayhave been removed or renamed by your anti-virus program. This problem hasbeen reported when using ThunderByte Anti-Virus software, manufactured byTCT-ThunderByte Corp, but may also be caused by other anti-virus programs.
You Quit the MAPI Spooler
You quit the Messaging Application Programming Interface (MAPI)Spooler (Mapisp32.exe) by pressing CTRL+ALT+DELETE, and clickingEnd Task in the Task Manager, but have other MAPI-enabled programs open whenyou try to restart Outlook.
If you have a missing or damaged file
Click Start, point to Find, and click Files or Folders.
In the Named box, type Mapisp32.exe, in the Look in list, click My Computer. Click to select the Include subfolders check box and click Find Now.
In the search results window, right-click Mapisp32.exe and click Rename on the shortcut menu. Rename the file, Mapisp32.old.
If you do not find the file, copy the Mapisp32.exe file from your setupcompact disc and set your anti-virus program to ignore the file.
If Mapisp32.exe is in the\Windows\System folder, uninstall Outlook, including Windows Messaging and reinstall Outlook.
If you quit the MAPI Spooler
Quit all MAPI-enabled programs before starting Outlook.
If you turn off your anti-virus software during installation, Outlook mayrun immediately after installation but display the errormessages in the "Symptoms" section after a restart of the computer. This is becauserestarting the computer starts the anti-virus software. TheThunderByte anti-virus software defaults to "Rename" for any new programfile found on the system. You must instruct it to ignore the Mapisp32.exeprogram. For information on how to do this, see your program documentation.
The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.