Importing data from Zephyr to SpiraTest

I'm looking for a new testing tool for my team, as we are having a lot of issues with Zephyr.  Our licence for Zephyr expires in the next couple of weeks, but we still have a project that is running on it. To be able to get agreement to get a new tool and not be lumbered with Zephyr for another year, I need to get all the currently used tests off Zephyr and onto SpiraTest.  Is there an easy way for me to export tests from Zephyr and import them into SpiraTest without too much hassle?

Thanks!

Hayley