Error 26 or "MAPI_E_NOT_SUPPORTED" with MAPI-Based Program
PSS ID Number: 156516
Article Last Modified on 5/12/2003
The information in this article applies to:
- Microsoft Internet Explorer 4.01 for Windows 95
- Microsoft Internet Explorer 4.0 for Windows 95
- Microsoft Windows 95
- Microsoft Windows 95 OEM Service Release 2.1
- Microsoft Windows 95 OEM Service Release 2.5
This article was previously published under Q156516
SYMPTOMS
When you run a Messaging Application Programming Interface-based (MAPI-
based) program in Windows 95, you may receive error number 26 or the error
message "MAPI_E_NOT_SUPPORTED."
CAUSE
This behavior can occur after you install Internet Explorer 4.0 or 4.01 or
the Microsoft Distributed COM Update for Windows 95 (DCOM95), or if you
are using a non-English version of Windows 95 OEM Service Release 2 (OSR2)
or later.
Earlier versions of the Windows Messaging System (WMS) Mapisrvr.exe file
do not support the COM call to the CoCreateInstance() function properly
and return the E_NOINTERFACE value.
NOTE: Because this problem does not occur in Windows 95 with the original
WMS until you install DCOM95 or Internet Explorer 4.0 or 4.01, the problem
may seem to be caused by either DCOM95 or Internet Explorer. The problem
actually occurs because the earlier Mapisrvr.exe file does not properly
support calls to the CoCreateInstance() function.
RESOLUTION
For English-language versions of Windows 95, you can resolve this problem
by installing the latest WMS for Windows 95. The latest WMS is available
from the following Microsoft Web site:
This update is included in Windows 95 OEM Service Release versions 2, 2.1,
and 2.5.
STATUS
Microsoft has confirmed this to be a problem with the earlier Mapisrvr.exe
file included with the original Windows 95 distribution. We are
researching this problem and will post new information here in the
Microsoft Knowledge Base as it becomes available.
Keywords: kbenv kberrmsg kbprb KB156516
Technology: kbIE400Win95 kbIE401Win95 kbIE95Search kbIEsearch kbOPKSearch kbWin95OPKOSR210 kbWin95OPKOSR25 kbWin95search kbZNotKeyword3