When trying to browse the Plugin for Exchange there is a popup saying "No Error".
If you manually run nvexchangeserver.exe from the command window you get an error popup saying, "The application was unable to start correctly (0xc000007b)".
No trace is produced by the Exchange plugin process in NetVault Backup
Download from Microsoft and install both 32 bit and 64 bit versions of Microsoft Visual C++ 2010 Redistributable.
Microsoft Visual C++ 2010 x86 Redistributable
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=Microsoft+Visual+C%2B%2B+2010+x86+Redistributable
Microsoft Visual C++ 2010 x64 Redistributable
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=Microsoft+Visual+C%2B%2B+2010+x64+Redistributable