Unfortunately, you probably did not receive an answer because there is no good suggestion ...
I looked at this several times earlier, first for the first beta version of TFS. (At the time we wanted to move away from VSS, waiting for TFS to be ready ... the trade-off we encountered was to use SVN in the interim, but used a post commit hook that kept the VSS repository in sync to allow this migration path to TFS.)
These guys (ComponentSource) were around the time with the VSS to TFS converter and added SVN to TFS alone, but it seems to have stopped the product ever since.
These guys (Kyrosoft) may have some promises, but I am worried that they do not publish prices and do not publish a list of customers (of two). If anyone has experience with the product, let us know.
TFS CodePlex, SVN ( 66 )
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