MS CRM 2011: Error during creation of Account record - System.Data.SqlClient.SqlException (0x80131904): Cannot insert duplicate key row in object 'dbo.EmailSearchBase' with unique index 'ndx_for_forward_update'

Today I have got this issue during creation of account. I have googled and found the same issue at CRM Development forum.

MS CRM 2011: Adding users to Team: Handling with plugins

Several times I have read that other developers were not able to handle event of adding users to teams with their plugins. I didn’t have any time for experiments till time I have got task to develop similar plugin.