Why does EIOBoard take up disk space in each user’s profile and how can I minimize it?

There are a few reasons why EIOBoard will take space in the user’s profile.

1. Logging.  EIOBoard saves log files to help developers debug software issues.  The max the file can grow to is 10MB.  You can turn this option off by setting a registry value in the HKLM or HKCU (HKEY_CURRENT_USER\Software\Savance\Eioboard Outlook Addin\EnableLog).  The value can be 1 or 0.
2. In version 7.1 or higher, caching was enabled to speed up the login process and make general usage of the product faster of all network connections.  A registry settings can be set to turn it on or off.  The setting can be placed in HKLM or HKCU (HKEY_CURRENT_USER\Software\Savance\Eioboard Outlook Addin\EnableCache).  The value can be 1 or 0.
3. VSTO loads DLL’s in a cache that is beyond the control of EIOBoard.  Read more about this here: http://blogs.msdn.com/b/vsod/archive/2008/11/01/office-customization-creates-loads-dll-from-temporary-folder.aspx