Been using Office Professional 2007 with Windows 8.1 Professional with no problems. Tested Trial Version of Office Professional Plus 2013(did not show any other choices) and all works great. So purchased Office Professional 2013 thinking everything would be the same. Not true, the new version is only CTR and no MSI version. Installed, uninstalled, installed from online, installed from standalone download. All CTR... what is up with that. Seems the CTR version is not allowing anti-spam software to work in Outlook. Looking on the net it seems I am not the only one. Been using Trend Micro for years and now it doesn't work. Looks like other third party Anti-spam software is in the same boat. On phone with Trend and Microsoft for hours with no resolution. Even re-installed a clean version of Windows 8.1, three times. Why can't Microsoft fix this...????? Just get a MSI version that we can download and use.  Have CTR as a option.... 

office 2013 is only available as click to run to most users. only volume licensees can get msi. Do you have the latest version of trend? it should work with c2r by now. 

Yes as of last week. (3-8-2015)