When a Microsoft Exchange Server 2010 Edge Transport server runs for several days, the Microsoft Edge Transport service (EdgeTransport.exe) consumes about 80 percent of CPU resources.
This issue occurs because a memory leak occurs on timer objects.
To resolve this issue, install the following update rollup:
Description of Update Rollup 2 for Exchange Server 2010 SP3
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.