what operating system can I upgrade my mid 2009 17in Macbook pro to
Which operating system can I upgrade my mid 2009 17in Macbook pro to?
MacBook Pro 17″, 10.11
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Welcome to the Apple Support Communities.
You can upgrade to OS X El Capitan if you have not already. Backup all data, then download and upgrade: How to get old versions of macOS - Apple Support.
Jack