▁and ▁family ▁can ▁be ▁connected ▁from ▁their ▁home ▁or ▁school ▁to ▁the ▁Internet ▁through ▁a ▁proxy ▁or ▁firewall ▁server , ▁or ▁through ▁a ▁hosted ▁service . ▁With ▁Microsoft ▁Exchange ▁Server , ▁each ▁user ▁can ▁have ▁a ▁secure ▁e - mail ▁address . ▁Using ▁a ▁Web - based ▁service ▁enables ▁students ▁to ▁particip ate ▁in ▁less ons ▁and ▁complete ▁assign ments ▁online ▁through ▁the ▁portal , ▁both ▁from ▁home ▁and ▁at ▁school . ▁ ▁ML G ▁versions ▁are ▁ 2 0 0 3 , ▁ 2 0 0 5 , ▁and ▁ 2 0 0 7 . ▁ ▁ML G ▁ 2 0 0 7 ▁is ▁built ▁on ▁Microsoft ▁Office ▁Share Point ▁Server ▁( MO SS ) ▁ 2 0 0 7 ▁and ▁integr ates ▁knowledge ▁management , ▁collaboration , ▁and ▁communic ations ▁techn ologies ▁from ▁Microsoft . ▁ML G ▁also ▁integrate ▁with ▁non - Microsoft ▁tools ▁and ▁systems . ▁ML G ▁uses ▁Microsoft ▁Windows ▁Share Point ▁Services ▁for ▁the ▁base ▁portal ▁layer . ▁On ▁top ▁of ▁this ▁layer , ▁a ▁framework ▁of ▁education ally ▁relevant ▁Web ▁parts ▁from ▁any ▁vendor ▁can ▁be ▁added ▁to ▁custom ize ▁a ▁solution . ▁Microsoft ▁has ▁created ▁a ▁set ▁of ▁Web ▁parts ▁and ▁custom ized ▁techn ologies ▁to ▁deliver ▁education ▁functionality ▁to ▁ML G . ▁This ▁includes ▁Web ▁parts ▁from ▁Microsoft ▁Class ▁Server , ▁Microsoft ▁Exchange ▁Server , ▁Microsoft ▁SQL ▁Server , ▁Microsoft ▁Office ▁Live ▁Communic ations ▁Server , ▁and ▁Microsoft ▁Office . ▁ ▁For ▁user ▁authentication , ▁ML G ▁uses ▁Microsoft ▁Active ▁Directory ▁service . ▁Nevertheless ,