Event ID: 1005

I am getting this Event ID: 1005 error everytime I start my NT workstation.
Event ID: 1005
Source: MSExchangeAdmin
Type: Error
Category: Monitoring
plus this text
Unexpected error <<0xc0040000 - The client operation failed. Microsoft Exchange Server Information Store ID no: 8004010f-0501-8004010f>> occurred.

Does anyone have any ideas?