Daer All, The situation is like below 1) We have two Sun Boxes Solaris 10 default 2) Each Sun Box will have one SAP and one OM Instance 3) We have to install 11.5.9, 11.5.10.2, SAP R3 4.7, MySAP 2004 ECC 5.0 4) what is the best combination 5) What can be the issues we may face from maintenance, managebility, patching, upgradation etc 6) All are purely development instance Good Luck..Subodh Deshpande =============================================== Experience Is Knowledge Wisdom Is Philosophy ============================================== -- _______________________________________________ Search for businesses by name, location, or phone number. -Lycos Yellow Pages http://r.lycos.com/r/yp_emailfooter/http://yellowpages.lycos.com/default.asp?SRC=lycos10