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A Software Development Consultant with over 20 years of experience. Many of his projects involved Exchange integrated applications, including a FAX server, a mail security product and anti-spam products.
The Transport Agent problems caused by Exchange 2013 SP1 are now fixed in Cumulative Update 5.
Some months ago we discussed how the highly awaited Exchange 2013 Service Pack 1 release was breaking many 3rd party Exchange applications:
Getting 3rd Party Applications to work with Exchange 2013 SP1
Service Pack 1 (aka Cumulative Update 4) is now superseded by the latest Cumulative Update release CU5 which is available for download from:
Cumulative Update 5 for Exchange Server 2013 (KB2936880)
CU5 fixes this problem keeping those critical add-ons running. Being a complete build, CU5 does not require the installation of SP1. Hence if SP1 is not yet installed we can avoid the problem altogether by moving directly to the latest CU.