[Koha] koha upgradeplease

[alaa Badri]

please i need documentation  about upgrade koa 2 to koha 3 without losing data 		 	   		  
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Windows Live: Keep your friends up to date with what you do online.
http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/social-network-basics.aspx?ocid=PID23461::T:WLMTAGL:ON:WL:en-xm:SI_SB_1:092010
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