To get around this issue the current solution is to remove any updates to the Office 2007, 2010, 2013 or 2016 products from October of 2017. UPDATE 20 November 2017
We have fixed the issue within our latest client apps, you can obtain the latest x86 & x64 versions at the link below.
32 Bit Version
https://download.imailserver.org/IMail-Client-Apps-x86.exe64 Bit Version