Installation failed- not digitally signed with a trusted certificate


  • Have a Windows Mobile 6.1 OS on Palm Treo Pro. PRIOR to setting up MS Exchange 2007 mailbox on device, any preloaded apps could be updated. User could download/install/update apps.  AFTER connection to MS Exchange 2007 established, no other installations/updates allowed.  This message received every time 

    "Installation was unsuccessful.The program or setting cannot be installed because it is not digitally signed with a trusted certificate."

    Neither Palm nor Mobile carrier able to resolve this issue. Device has been hard reset, reset to manufacture original shipping settings, device even replaced.  Only way is to update and install/update software prior to establishing MS Exchange 07 connections. 

    However, some software, such as Windows updates have updates that need updating more than once. And, while few apps are installed, if one should find an app to install, it can not be installed once MS Exchange connection is up and running.

    Have tried this with no success

    Is their a resolution for this issue?


    Monday, March 08, 2010 1:26 AM

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