Cause: Your organization uses Exchange Server 2003 or an earlier version.
 | Solution: Check with your account administrator to see what version of Exchange Server
is managing your account. |
Outlook for Mac
supports accounts managed by Microsoft Exchange Server 2007 Service Pack 1 with Update Rollup 4 (KB952580)
and later versions.
Cause: Your account credentials or Exchange server name are incorrect.
 | Solution: Verify your account settings. |
-
On the Tools menu, click Accounts.
-
In the left pane of the Accounts dialog box, select the account.
-
Verify that the account settings are correct.
 | Tip To confirm that you are using the correct credentials, try to connect to your account from another Exchange
application, such as Outlook Web App. |
Cause: Outlook is set to work offline.
 | Solution: Verify that Outlook
is online. |
Cause: Your network connection is unavailable.
 | Solution: Make sure that your computer is connected to the network. |
For instructions on checking the status of your network connections, see Mac OS
Help. Or, you can contact your Exchange
server administrator or your network administrator. You can also ask a colleague who uses similar settings if he or she can connect to the network. Or, if you connect to your Exchange
account over the Web, use a Web browser to see whether you can access Internet sites.
Cause: The server that is running Microsoft Exchange Server is unavailable.
 | Solution: Check your Microsoft Exchange
server connection. |
-
On the Tools menu, click Accounts.
-
Look at the Exchange
account in the left pane. If there is a problem with the connection, the indicator icon will be orange.

If you successfully connected to the account before, try to connect to it from another Exchange
application, such as Outlook Web App. You can also check the status of the Exchange
server by contacting your Exchange
server administrator.
Cause: Your Exchange account requires you to log on by using an encrypted channel.
 | Solution: Contact your Exchange
administrator to learn if your account requires an encrypted channel and, if this is the case, verify the setting for this channel. |
-
On the Tools menu, click Accounts.
-
In the left pane of the Accounts dialog box, select the account.
-
Click Advanced, and then click the Server tab.
-
Under Microsoft Exchange and Directory service, select the Use SSL to connect check boxes.
Cause: Your computer requires a mail proxy server to connect to the Exchange server.
 | Solution: Contact your Microsoft Exchange
account administrator. |
Ask your Microsoft Exchange
account administrator to tell you which
proxy serverA computer or application that serves as an intermediary between your computer and a server on the Internet. For security reasons, a corporate network may require you to go through a proxy server to reach certain Web sites or e-mail services.
to use to connect to the Microsoft Exchange
server. For information about how to configure a connection to a proxy server, see Mac OS
Help.