Combining TFS with Jira - any experiences or advice?

Ok, I'm a big fan of Jira particularly the later versions as a knowledge management system to use across stakeholders and development in a corporate setting.

However, I'd like to marry it with the usage of TFS 2010 - does anyone have experience of running both systems in parallel and was it a headache, did it make sense, etc?

The task items of TFS are of course a form of duplication when we look at Jira items of course.

However, finding a good version control system that supports branch and merge from the roots up is the issue. For reasons of corporate policy, TFS looks like the easiest candidate out there to adopt at the present time.