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Outlook taking a long time to open

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In this scenario, it takes two to three minutes to obtain the initial connection. You start Outlook, and it tries to connect to. You configure Microsoft Outlook 2010 or Microsoft Outlook 2013 to connect to the newest Microsoft Office 365 mailbox (Wave15). You enable the Bypass proxy server for local addresses option. You configure the proxy bypass list to contain settings for internal servers.

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You configure a computer that is running one of the following operating systems to use this proxy server for all protocols:

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You have a third-party proxy server that enables communication only over port 80. Windows 8.1 Windows 8.1 Enterprise Windows 8.1 Pro Windows Server 2012 R2 Datacenter Windows Server 2012 R2 Essentials Windows Server 2012 R2 Foundation Windows Server 2012 R2 Standard Windows 7 Professional Windows 7 Enterprise Windows 7 Ultimate Windows Server 2008 R2 Datacenter Windows Server 2008 R2 Enterprise Windows Server 2008 R2 Foundation Windows Server 2008 R2 Standard Outlook 2013 Microsoft Outlook 2010 More.