One series of events that might occur, requiring the removal and reinstallation of the Event Service is:
Event ID : 0
Source : MSExchangeES
Type : Informational
Category : General
Description: The Microsoft Exchange Event Service (5.5.1960.3)
Started successfully.
Event ID : 5
Source : MSExchangeES
Type : Error
Category : General
Description: An unexpected MAPI error occurred. Error returned
was [0x80004005].
Event ID : 1
Source : MSExchangeES
Type : Informational
Category : General
Description: The Microsoft Exchange Event Service stopped successfully.
Before removing the Event Service as a solution, verify that this server is a public folder server. If the server is not a public folder server, the Events Service will not start. For additional information, please refer to the following article in the Microsoft Knowledge Base, which explains this requirement in more detail:
182082
: XADM: Event Service Won't Start If Alternate PF Server Selected