We are planing to upgrade 11i to R12 with below environment.
Operating System : Windows 2003 64-bit.
E-Business Suite Version : 126.96.36.199
Database : 10gR2
Please suggest the Methodologies used to upgrade ebs on Windows.
Upgrade Advisor: E-Business Suite (EBS) Upgrade from 188.8.131.52 to 12.1.3 [ID 269.1]
Oracle E-Business Suite Release 11i Information Center - Upgrade [ID 821997.1]
Planning Your Oracle E-Business Suite (EBS) Upgrade from Release 11i to Release 12 [ID 1406960.1]
Please note that 12.1.x is not certified on Windows 64-bit for fresh installation so you will need to install on Windows 32-bit then migrate to 64-bit.
Oracle E-Business Suite Installation and Upgrade Notes Release 12 (12.1.1) for Microsoft Windows Server (32-bit) [ID 761567.1]
Migrating Oracle E-Business Suite R12 to Microsoft Windows Server 2008 R2 [ID 1188535.1]
In addition to the above docs please see:
Oracle E-Business Suite Upgrade Guide Release 11i to 12.1.1 [ID 1082375.1]
Oracle E-Business Suite Upgrades and Platform Migration [ID 1377213.1]
Database Preparation Guidelines for an E-Business Suite Release 12.1 Upgrade [ID 761570.1]
If you want to upgrade to 12.1.3 later then please refer to https://blogs.oracle.com/stevenChan/entry/ebs_1213_available