Hi Aneez,
TestComplete (TC) is a test automation tool with a very limited test management functionality. (For the test management see, for example, ALMComplete at
http://smartbear.com/products/software-development/application-lifecycle-management-tool) That means that TC can execute automatically some actions sequence (either programmed, or recorded or represented as a Manual Test) and log the result of execution. That's all. While you can use its test log posting functionality, this is not what I would consider seriously, but rather expect that it is test management tool that should be able to pick up test results reported by different test runners.
Some test management tools (e.g. ALMComplete, devTest, etc.) are already TC-aware and has a functionality that makes it possible to 'link' TC test to some test description managed by this tool, execute TC test when user starts test in the tool, pick-up reported result from TC log and report the test as passed or failed. Some tools (e.g. TeamCity) do not have the above functionality and you will have to setup some custom actions to make them possible to access results of the test done by TC.
AFAIK, TFS can internally manage only unit and manual tests in its own format and does not allow to link external test runner to there tests. TestComplete can be integrated with TFS (see relevant help topics -
http://support.smartbear.com/viewarticle/12192/ and others) with test results reported within TFS's Test Results pane. So, if I got you right, you will have to migrate your TFS-based acceptance tests to TC-based automated tests.
