Duplicate content on mobile sites

[AndersDK]

Hi Guys

We are launching a mobile webshop later this year and have decided to use a subdomain for this. (m.domainname.xx).

The content will be more or less identical with the one on the standard desktop site (domainname.xx), but im struggeling to find out if this will create dipplicate content between the mobile and desktop site.

Does anyone have a solid answer for this one?

[Webmaster_SEO]

It will not create duplicate content issues if the 301 redirects are placed technically correctly (so whenever a request from mobile device or googlebot-mobile comes it should redirect to mobile site only). Here is a link to Google blog that talks about most commonly asked queries related to mobile sites: http://googlewebmastercentral.blogspot.com/2011/02/making-websites-mobile-friendly.html

Hope this helps