Release notes

Release notes for the following releases:

• 12.3
• 12.2
• 12.1
• 12.0
• 4.15
• 4.14
• 4.13
• 4.12
• 4.11
• 4.10
• 4.9
• 4.8
• 4.7
• 4.6
• 4.5
• 4.4
• 4.3
• 4.2
• 4.1
• 4.0
• 4.0_beta1