Email Configuration – Use Autodiscover Feature Without Exchange

By default the autodiscover service will try the root domain first before trying autodiscover.example.com. The client doesn't notice and it continues on just fine.

There are ways in the registry to prevent clients like Lync and Outlook from using the root domain lookup and always using autodiscover.example.com instead. There's just not a way to do it on a global scale unless you deploy these settings to all clients via GPO/etc. and even then you don't touch smartphones, ipads, etc.

So, yeah, your best bet is a redirect on the web server if you don't want the 404s to accumulate (and they will quickly). Another option if apache can do it (I'm not an apache admin) might be to suppress/auto-discard 404 errors for this particular url. But most likely a permanent redirect to the correct url of autodiscover.example.com/autodiscover/autodiscover.xml will suffice. Either way, the traffic is going to hit your webserver unfortunately.

Outlook and mobile devices (even software applications with Outlook in their name) connect in completely different ways. Therefore it is certainly possible for it to work for ActiveSync on mobile and to not work on Outlook in Windows.

"...how can I make Outlook works without modifying anything on server side."

Are you not the server admin? Outlook Anywhere needs to be specifically enabled on Exchange 2010 but there can be good reasons why it isn't enabled on your server. Trying to bypass restrictions placed on your network by the admins is not allowed on this site.