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I did something simlar a few years ago, of course they all wont move over, but I found stating the following helped:
- No ad banners, or annoying pop-ups (like yahoo)
- Faster service
- Competition (maybe)
- Features - Features within XOOPS far out weight those of yahoo groups, especially the new forum (newbb2), then pm'ing notification of only forums you wish to see.
- Privacy (hide E-mail)
Then depends on your modules, like photo albums (myalbum, Xgal, etc), calandars, blogs, etc, etc