We are in the planning process to stand up Office 365. We had thought we would use AD/FS, but our admin people are thinking of going with a 3rd party tool for single signon (www.okta.com). I'm an in Applications, supporting SharePoint 2010, so my knowledge of authorizations is limited, as is my knowledge of SP2013 and SPO in general.
Does anyone have any thoughts if this is likely to cause problems if we don't stick with Microsoft's AD/FS? We're a little worried we could get hit with problems we can't even guess at. Are there features we would likely miss if we did this? Would it affect Search and the authentications it does to the crawled sites? Has anyone tried this and have either success or failure stories about it?