| Event Id | 1320 |
| Source | MSExchange Message Security |
| Description | Either the specified user account is already a member of the specified group, or the specified group cannot be deleted because it contains a member. |
| Event Information | According to Microsoft : Cause : An application has requested a change to the security accounts database that could not be carried out. Resolution : If the account is already a member of the group, there is no need to retry this. If the group cannot be deleted because it contains members, delete all members from the group and then retry. |
| Reference Links | Event ID 1320 Source MSExchange Message Security |
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