I just upgraded all the Macs in one of my client's office to SL. They use Entourage connected to an Exchange server for email. Entourage now regularly drops the connection to the server from one of the iMacs, and the only way to reconnect that we have found is to restart the iMac. The Entourage acct is set up like this: Account settings tab: email addr: firstname.lastname@example.org Authentication: Acct ID: user Domain: (blank) Password: xxxxx Advanced tab: Exchange server: corp.company.com "This server requires a secure connection" is checked LDAP server: corp.company.com "This server requires me to log on" is checked All other Entourage settings are unchecked or at default settings. The connection to both the local network and the internet is via wired ethernet, though there are wireless networks available and Airport is turned on. Web browsing works even when the Entourage connection fails. Any help is greatly appreciated!