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(2014-12-11, 06:56 PM)mwforum Wrote: [ -> ]I would also like to know how to do this. I have a member who left and asked that his membership be deleted but we kept his posts and now he's back and I'd like to merge his old posts with his new posts.

Thanks.

Yes this would be a great plug-in. Same issue here.

^ if you can run SQL queries then there is no need of a plugin. (if required, see SQL queries guidance)
basically suggested queries here should be sufficient to revive a user account.