Use the following procedure to install Office Communicator Mobile using ActiveSync version 4.5.

To manually install Office Communicator Mobile using ActiveSync
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Connect your mobile device to the computer running ActiveSync and verify that ActiveSync is showing a connection to the mobile device.
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In Windows Explorer, double-click COMMUNICATORMOBILE.SP.MSI (for Smartphone devices) or COMMUNICATORMOBILE.PPC.MSI (for PocketPC devices) installation file.
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On the Welcome to the Microsoft Office Communicator Mobile Setup Wizard page, click Next.
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Review the license agreement, click I accept the terms in the license agreement (required to continue installation), and then click Next.
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Do one of the following:
- To use the default location to install the program files, click Next.
- To change the location where the program files are installed, click Location, type the location of the computer where you want to install the Communicator Mobile files, and then click Next.
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Click Next.
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In the Installing Applications dialog box, click Yes.
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In the Application Downloading Complete dialog box, click OK.
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Click Close.
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Check your mobile device for any additional steps that you need to complete.