I upadted the client from windows xp office 2003 to Windows 7 and office 2010 , everything worked fine but one of the users facing a very bad performance in outlook 2010:
Very long time to connect to the Exchange server.
The client shows event ID 26 connection to microsoft exchange hass been lost , connection to microsoft exchange hass been restored ( 8 time in 10 minutes).
Very long time to do any operatio as open address book, send mail.
No other users complians.
No errors appeared in the Exchange server ( MS exchange 2003 Standard SP2 on Win server 2003 standard)