Meaning of: Ordinal 21 Not Found in MAPI32.DLL?

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From: Jack (anonymous_at_discussions.microsoft.com)
Date: 07/15/04 

Date: Thu, 15 Jul 2004 12:12:47 -0700

Upon logging in, I now get a dialog box indicating an
error related MAPI32.DLL. The specific error message in a
dialog titled "applnch.exe" is:

"The ordinal 21 could not be located in the dynamic link
library MAPI32.dll"

A search for applnch.exe indicates the program is in the
C:\Program Files\Microsoft Windows Small Business
Server\ClientSetup\Clients\Setup folder.

A Google and Microsoft KnowledgeBase search didn't reveal
the true meaning of this cryptic missive.

What does it likely mean and do I need to worry about it?

TIA.

Jack