Deleting contacts

Recently I started a Microsoft account, having done this I then found I couldn't start my Windows 8.1 PCs without using my password. OK I can live with this and at least it synchronised my Live Mail so when I bought a new PC my contacts were 'imported' when I installed WLM. I then found problems with WLM 2012 so I thought I'd look into the 'Mail' app of 8.1. Having entered my email account I then found all my contacts seem to have been added as 'People'. I don't think much of 'Mail' so uninstalled WLM 2012 and installed WLM 2011. Now I find I have twice as many contacts as previously. Same people but everyone is duplicated, my categories have twice as many names as previously. I find I can delete these duplicates from a 'category' (a tedious process) but am unable to remove them from the main list. In fact I am unable to delete ANY entry from the main list. This is inconvenient. What happens when contacts DIE?? I have my MP listed as a contact. If subsequently he is found to be another Cyril Smith will I be considered similarly guilty by association? If he loses his seat at the next election I will no longer need his email address but it seems as if it is non deleteable.