SYMPTOMS
Microsoft Exchange Server versions 5.0 SP1 and SP2 may generate an Offline
Address Book (OAB) that results in an offline user occasionally receiving
non-delivery reports (NDRs) when attempting to send messages to particular
addresses in the OAB. The error message returned to the sender may be
similar to the following:
No transport provider was available for delivery to this recipient.
RESOLUTION
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. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Microsoft Exchange Server version 5.0 servicepack that contains this hotfix.
To resolve this problem immediately, 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:
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 typical 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:
Component: Offline Address Book