I am having an issue with Outlook 2011 for Mac failing to start. It is running the latest version 14.6.3 on Mac OS 10.10.5 and every time I try to launch it, it throws up an error message saying "Outlook failed to launch. Unknown error" and then after closing the error message Outlook just drops out.

I have tried rebuild the identity which didn't work, removed preference files, tried creating a new identity, tried starting in safe mode and none of it has worked. I'm beginning to feel the only option left is to uninstall and re-install which I'd rather not do if I can get away with it, but as the error message is completely useless as it doesn't give you any idea of what is causing the problem. I'm sure that if this was on a Windows PC then I could run a repair Office and have the issue fixed but as MS would rather have you running Office on a Windows PC than a Mac they haven't added in many of the actual useful features in Office of Mac such as the ability to repair the installation. Has anyone else seen this issue and found a resolution that doesn't involve a re-install. If not then it looks like I'll be having an unpaid late night to get this software re-installed.