It’s not absolutely clear which product this file is part of and who is its author. Sometimes files like this can be dangerous. Make sure UmOutlookAddin.dll is a safe file by scanning your computer for viruses.
UmOutlookAddin.dll is usually located in the %PROGRAM_FILES% sub-folder and its usual size is 436,512 bytes.
Common path(s): subfolder in %PROGRAM_FILES%Filesize(s): 436,512 bytes