When this problem occurs, the following error is logged in Event Viewer:
Event Type: Error
Event Source: MSExchange Common
Event Category: General
Event ID: 4999
Description:
Watson report about to be sent to dw20.exe for process id: <ID>, with parameters: E12, c-RTL-AMD64, <version number>, M.E.Imap4, M.E.D.Storage, M.E.D.S.MailboxSession.get_TimeZone, System.ObjectDisposedException, 98d1, <version number>. ErrorReportingEnabled: True