@garak0410 said in Invoice Software - Office 365 Or Purchase Software Suite?:
And this point, it would be easier for me if I could run this Invoice Ninja (self-hosted) on my Windows Server 2012 R2 Applications/Web Server but even had struggles getting that going...
Did you try @Romo's installer for it? Should make Ubuntu 16.10 the easiest option since it is known to work already. PHP, MariaDB and all of that on Windows is quite a pain, in general.