Exchange 2013 upgrade

HI
I have just upgraded Exchange 2007 with 2013 and so far I have emails sending and receiving and all has gone well but for one thing I seemed to have made a mistake with, I cannot get outlook to connect to the exchange server? I can connect both internally and externally using webmail?
What should I be looking for to solve this?
I need to go live tomorrow?
dances1960Asked:
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MAS (MVE)EE Solution GuideCommented:
Did you point common name to Exchange2013 server(both internal and external) ?
If not please change it and try.
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dances1960Author Commented:
Hi Yes I have pointed the common name although it's still not connecting internally,
Externally however when I pop in the server details and username outlook does connect but changes the server name to a series of numbers followed by the domain something like the following
141434fdssdfdsfwe2233qfq@domain.com ?
Another thing while moving mailboxes to the new exchange some are failing due to the size limit being over 2.3gb can I increase this so they will copy over.
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Tej Pratap Shukla ~DexterServer AdministratorCommented:
hi,
  You should manually configure Outlook once. Sometimes in the upgrading process , configuration is not done properly.
 Follow these steps

1.  Click start menu, go to control panel and select mail.
2.  Click Show Profiles, click Add, enter a name for this profile, and then select OK.
3.  On the Auto Account Setup page of the Add New Account wizard, select Manually configure server settings or additional server types, and then click Next.
4.  On the Choose Service page, select Microsoft Exchange or compatible service, and then click Next.
5. On the Server Settings page, perform the following actions:
     A. In the Server text box, type outlook.
     B. Select the  the Use Cached Exchange Mode check box.
     C. In the User Name text box, enter your entire email address.
     D. Click More Settings.
6. In the Microsoft Exchange dialog box, click the Connection tab and select the Connect to Microsoft Exchange using HTTP check box. Then, click Exchange Proxy Settings.
7. In the Microsoft Exchange Proxy Settings dialog box, perform the following actions:
     A. In the Use this URL to connect to my proxy server for Exchange text box, enter mex06.emailsrvr.com.
     B. Select both the On fast networks and On slow networks check boxes.
     C. Under Proxy authentication settings, select Basic Authentication.
     D. Click OK.
8. In the Microsoft Exchange dialog box, click Apply and then click OK.

9. On the Server Settings page, click Check Name, type your password, and then click OK.
10. Click Next, and on the next page, click Finish.
11. Open Outlook to select your new Exchange profile.
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dances1960Author Commented:
Hi

Sorry for taking so long in replying .

I have tried the above but sadly its still not connecting both internally and externally, I get the error message: the action cannot be completed. The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.

I am using webmail across the company at the moment.
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