A name in the distribution list can't be resolved

There is an unresolved entry in a distribution list.  When I click the distribution list.  There is a message popping up as below:

A name in the distribution list can't be resolved.  To send a  message to this distribution list, remove the member marked "Unresolved entry"

I have the following questions:
1. Is this distribution list usable now?
2. Will this "Unresolved entry" disable the distribution list?
3. Will it be any problem if I remove this "Unresolved entry" from the distribution list.
4. What causes this problem?

Thank you for your kind attention.

Best regards,

sc  
jshcAsked:
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SembeeConnect With a Mentor Commented:
The list is probably still usable. However you should remove the unresolved entry - it shouldn't cause any problems. Various causes for the error - an account, contact or other item wasn't removed correctly, or was removed from one of the other servers and the information hasn't replicated back correctly.

Simon.
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