Mac not connecting to exchange outside the domain

One of our clients has a SBS2011 server with exchange 2010.

And one of the users has a mac with outlook 2013 installed on it. The user has two issues. When he is inside the domain outlook has a hard time connecting to exchange because he brings the mac home and when he comes back into his office he has to restart the mac for exchange to connect to his outlook. It seems the mac still thinks its on his home network.

And also is there a setting in the mac outlook program to change so they can connect to exchange outside the Domain.
BBraytonAsked:
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Don ThomsonCommented:
Can we assume that the MAC user get's it's IP using DHCP from the server?  I know that in systems where the DHCP is obtained from the router, that connecting to exchange can be a problem at times as the DNS doesn't find the Exchange server fast enough.

If this is the case - try using the Exchange IP instead the Server name.  If the user can connect to the Exchange server using a VPN then connecting to the exchange from an external location should be fine.

As far as the MAC remembering the IP from his home   try this

    1. Close any open Internet applications (such as Web browsers and email). Be sure to save any changes to any open documents.
    2. Choose System Preferences from the Apple menu.
    3. Choose Network from the View menu.
    4. Choose Active Network Ports from the Show menu.
    5. Deselect the "on" checkbox for port you use to connect to the Internet (such as Built-in Ethernet or AirPort).
    6. Click Apply Now.
    7. Reselect the checkbox for the port.
    8. Click Apply Now.
    9. Open a Web browser, and attempt to connect.

If the internal IP at his home network is using the same subnet as the office network  then the NIC will not automatically grab a DHCP change when going from the home to the office and will get very confused
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BBraytonAuthor Commented:
Yes he is using the same subnet at home and the office. and DHCP is on the server not the router.
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