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I get the following error message in the Exchange Server Toolbox:
Error: Failed to retrieve mail from archive store because an error occurred when trying to validate its signature. Failed to verifiy message with provided parameters, the signature may be invalid: The Object already exists
Search in C:\ProgramData\Microsoft\Crypto\RSA\ and all subfolders for the following files:
1. 19c988cf76b533f74aaffc201e63f98e_0d5fcf7f-9733-4ba0-a71e-c5b558768432
2. f686aace6942fb7f7ceb231212eef4a4_018e9184-1f67-46e7-b4c1-c3539d31c630
Make sure that the user under which the Exchange Server Toolbox service is running has full access on these files.