This guy had the same problem, notice this is a copy/paste job from another forum.
lukasszmidt commented Tuesday, Nov 13
Installed the preview on my 8X but encountered weird issues with people hub and Me-hub. Contacts linked in a wrong way (for example all contacts with same first name linked together), editing of linked contacts resulted into crash to startscreen,editing of unlinked contacts crashed the people hub as well, e-mail accounts not syncing, facebook account not syncing ("not up to date" status in Settings/E-mail and account, with error 83CF3105 when forced to sync) ... Uninstalled Skype, and everything is back to normal, everything syncs, no errors.
I didn't expect uninstalling Skype to fix these seemingly unrelated issues, but apparently it did. I'll wait for full version. No other apps were installed except Skype, so I do believe Skype caused all this.