Sometimes incoming emails are not processed correctly by ServiceDesk 7 and error messages stating: "Thread was being aborted" appears in sd 7 logs.
Cause: By default email monitor project when deployed to iis works 90 seconds and then terminates.
Solution: You should increase the timeout of the Email monitor webservice. In order to do that in email monitor project go to "Resources" tab and find web.config file. Open it for edit and add the string: httpRuntime executionTimeout="number of seconds" and then deploy the project. We increased the timeout up to 100 minutes so our string looked like: httpRuntime executionTimeout="6000". After that the error disappeared.