Macintosh Outlook Clients Cannot Connect to Exchange Server Through Internet Security and Acceleration Server

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Article ID: 331063 - View products that this article applies to.
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When you use Internet Security and Acceleration Server (ISA) to publish an Exchange server and give external clients permission to connect to an internal Exchange server, x86-based Outlook clients can connect to the Exchange server, but Macintosh Outlook clients cannot connect to the Exchange server.


This problem occurs because the remote procedure call (RPC) filter (Rpcfltr.dll) included with ISA cannot convert the big-endian format of a Macintosh UUID to little-endian format.


A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:;EN-US;CNTACTMS
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 English version of this fix should have the following file attributes or later:
   Date          Time    Version          Size   File name
   25-Nov-2002   05:19   3.0.1200.181   47,888   Rpcfltr.dll



Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.


Article ID: 331063 - Last Review: October 26, 2013 - Revision: 1.3
  • Microsoft Internet Security and Acceleration Server 2000 Standard Edition
  • Microsoft Internet Security and Acceleration Server 2000 Service Pack 1
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