The EdgeTransport process repeatedly crashes on a Microsoft Exchange Server 2013 server that has the Edge Server role installed.

To determine whether you are experiencing this issue, check the Application event log for an Event ID 4999 that resembles the following:

Log Name: Application
Source: MSExchange Common
Event ID: 4999
Task Category: General
Level: Error
Keywords: Classic
User: N/A
Watson report about to be sent for process id: 2964, with parameters: E12IIS, DART-buddy-DBG-AMD64, 15.01.0404.000,, 5904, 15.01.0403.000.
ErrorReportingEnabled: True
exData=|exHResult=-2147024894|exStacktrace= at Microsoft.Exchange.MessagingPolicies.Rules.TransportRulesErrorHandler..cctor()|exTargetSite=|

, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.exData=|exHResult=-2147024894|exStacktrace= at Microsoft.Exchange.MessagingPolicies.Rules.TransportRulesErrorHandler..cctor()|exTargetSite=|exSource=Microsoft.Exchange.MessagingPolicies.Rules|exMessage=Could not load file or assembly 'Microsoft.Filtering, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
If you have any 4999 events that resemble this and the 4999 event includes the following text in the Description field (also highlighted in this 4999 event for clarity), then you are experiencing the symptoms described in this article:

edgetransport, M.E.MessagingPolicies.Rules, M.E.M.R.TransportRulesErrorHandler..cctor, System.TypeInitializationException

exSource=Microsoft.Exchange.MessagingPolicies.Rules|exMessage=Could not load file or assembly 'Microsoft.Filtering


This issue occurs if a rule is configured to delete messages that have specific text in the subject or in the body of a message. For example, this issue occurs when the rule contains the -SubjectOrBodyContains condition (also known as predicate). When any messages that don't match the rule are processed, the EdgeTransport process crashes.

Additionally, this issue occurs when another rule experiences an error during evaluation. In this case, the TransportRulesErrorHandler class is called and the EdgeTransport process crashes.


To resolve this issue, install Cumulative Update 13 for Exchange Server 2013 or a later cumulative update for Exchange Server 2013.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


Learn about the terminology that Microsoft uses to describe software updates.

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