10G speeds are beginning to gain steam in Enterprise networks.  The rising standard for running 10G speeds over Multimode fiber is the LRM module standard.  This is the best balance of distance and compatibility with current multimode optical fiber that can run at 10G speeds.  Here is a good primer on LRM fiber specs and how it should be used:

http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/prod_white_paper0900aecd806b8bcb.html

Further information on how to test Multimode fiber for LRM 10G speed compatibility see attached white paper.