Software 
TCP and UDP ports used by Apple software products
Learn more about TCP and UDP ports used by Apple products like OS X, OS X Server, Apple Remote Desktop, and iCloud. Many of these are referred to as “well known” industry standard ports.
If you can’t update your Signed Configuration Profile in iOS 8.3
If you can’t replace an existing profile on an iOS 8 device, update the device to iOS 8.3. Then, remove the existing profile and install its replacement.
Redirected to 201718 [was Find the serial number on your iMac]
You can find your serial number for your Intel-based iMac (Mid 2007 and later) in OS X, on the base of the computer, the product packaging, or on your original receipt or invoice.
About Windows Migration Assistant
Learn about how to use Windows Migration Assistant to migrate your files from a Windows PC to a Mac.
Adobe Flash Player updates available for OS X on June 26, 2015
Adobe Flash Player updates address a recently identified Adobe Flash Player web plug-in vulnerability.
If you see duplicate contacts after setting up iCloud Contacts
After you set up iCloud Contacts, you might see duplicated contacts on your iOS device, Mac, or PC.
About the power tone on your MacBook when plugging it into AC power
Learn about the tone you hear when you plug in your MacBook (Retina, 12-inch, Early 2015) to its AC power adapter.
Ports and adapters for your MacBook (Retina, 12-inch, Early 2015)
Learn about the different ports and adapters for your MacBook (Retina, 12-inch, Early 2015).
Find out which SIM card your iPhone or iPad uses
Use the tables below to find out which SIM card your iPhone or iPad uses.
If your Xsan volume does not start after enabling native extended attributes
Learn what to do if you see an Xsan-related panic in your server logs that mentions an Inode version mismatch.
