The problem I had was when trying to sync my Evo 4g to Exchange 2010. I continually got the message "Failed to create the account. Please try again later". After searching on this site and trying everything on every thread, I was about to throw my hands up and send it back when I found the solution. This solution appears to not be posted on this site, so I figured I would help out others that might run into the problem in the future. I have done this now 2 or 3 times for other users that have had this issue and it has corrected it. I don't claim this solution will work for everyone, it simply what I did to correct for my users. I would suggest trying what other threads have as solutions before trying this one. The problem I had seems to be with security rights. For some reason I did not have the correct permission in AD even though I was a Domain Admin. As it turns out everyone in my OU didn't either. I would have to investigate it more to find what security right was missing. The only way to fix this issue is by having access to Active Directory on a server with Exchange plugins. Go Active Directory Users & Computers (Enable Advanced Features if needed) Open the properties of the user that is having the issue Click on the Security Tab Click the Advanced button In the Default Permissions tab check the box at the bottom for "Include inheritable permissions from this object's parent" Wait for AD to propagate (5-10 minutes) Try again So that's it. Hopefully this helps someone at some point fix their issue.