Quoted below is information I I found at Yuku Support this morning.
Suzanna
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"Having received many requests by MSN group owners about a possible migration of their group to yuku, we are happy to announce that we have built a tool to migrate those groups.
What we import:
We will import your entire group:
* All forums and discussions
* Calendar
* Your images
* Your entire member list, including member levels (Manager, assistant manager, member)
* Your member's email addresses, they will not have to re-register at yuku. "