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Looks like 3 years supported + 4 (additional) years unsupported.

Support for Existing WSDL Versions
Published 03/05/2011 02:25 PM   |    Updated 04/03/2020 01:39 AM   |    Answer Id: 10817

<https://netsuite.custhelp.com/app/answers/detail/a_id/10817>

```At any time, the six latest endpoints are supported. For example, with the 2020.1 endpoint generally available, the following WSDL versions are supported:

2020.1

2019.2

2019.1

2018.2

2018.1

2017.2

If you use an older version, NetSuite recommends that you upgrade to the latest WSDL version.

NetSuite also makes the eight additional endpoint versions from the previous four years available without support. This means that in addition to the fully supported endpoints listed above, the following eight endpoints also remain available:

2017.1

2016.2

2016.1

2015.2

2015.1

2014.2

2014.1

2013.2```

Thanks, This helps to set priority to upgrade immediately. Thanks v much!,

Right so in theory - you're good for a while - but you are effectively not supported by NS if anything arises.