I ran into a weird problem with Office 365 tonight, so though I’d hit up you guys on the blog to assist if you experience the same strange behaviour.I blew away my Office 365 lab to re-create a customer’s requirements for an Exchange 2007 hybrid deployment on Windows Server 2008 R2.All was going fine until I went to set up the federation and downloaded the Windows Azure Active Directory Powershell module. I promptly got the following error thrown up by the installer:-Assuming I had dropped the ball, I went to check my installation of the sign-in assistant. Sure enough, it was already installed!I quickly went and redownloaded the application, reinstalled and restarted the server but the error wouldn’t budge! The solutionDownload the BETA tool for Microsoft Online Services Sign-In Assistant instead of the RTW version and it will work fine! Must be some weird behaviour in the pre-requsite checking mechanism that still hasn’t been fixed.DOWNLOAD LINK – http://www.microsoft.com/en-us/download/details.aspx?id=39267 DOWNLOAD LINK – http://www.microsoft.com/en-gb/download/details.aspx?id=28177 Hope this helps.Neil