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When I initialized my Windows Phone, I lost my group (I did synchronise my live account).
Until I used windowsphone, searching a person by group was very convenient...
Is it impossible to back up groups into a live (Hotmail) account?
If you store your contacts in Windows Live, those will be backed up. However, groups you create cannot be at this time.
Check out the backup tag for information on what can be backed up, as well as some workarounds for other things.
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