[excel] (Platform support) Address some backwards compatibility questions (#587)

* Address some backwards compatibility questions

* Adding note about old versions of Excel opening scripts

* Update docs/develop/script-buttons.md

Co-authored-by: Alison McKay <[email protected]>

* Merging

---------

Co-authored-by: Alison McKay <[email protected]>

Author: AlexJerabek

docs/develop/script-buttons.md

@@ -2,7 +2,7 @@
 title: Run Office Scripts in Excel with buttons
 description: Add buttons to workbooks that control Office Scripts in Excel.
 ms.topic: overview
-ms.date: 10/01/2022
+ms.date: 03/10/2023
 ms.localizationpriority: medium
 ---
 
@@ -24,6 +24,10 @@ The following screenshot shows the script details page for a script titled **Cre
 
 To stop sharing a script through a button, go to the **More options (…)** menu in the script details page and select **Stop sharing**. This removes all the buttons that run the script. Deleting a single button removes the script from that one button, even if the operation is undone or the button is cut and pasted.
 
+## Older versions of Excel
+
+Script buttons won't work when opened in [versions of Excel that don't support Office Scripts](../testing/platform-limits.md#platform-support). In that case, the button still appears, but selecting it has no effect.
+
 ## See also
 
 - [Platform limits and requirements with Office Scripts](../testing/platform-limits.md)

docs/includes/platform-requirements.md

@@ -1,6 +1,6 @@
 To use Office Scripts, you'll need the following.
 
-1. Excel for Windows, for Mac, or on the web.
+1. Excel for Windows (version 2210 or higher), Excel for Mac, or Excel on the web.
     1. The [Action Recorder](../overview/excel.md#action-recorder-web-only) is only available in Excel on the web.
 1. OneDrive for Business.
 1. Any commercial or educational Microsoft 365 license with access to the Microsoft 365 Office desktop apps, such as:

docs/testing/platform-limits.md

@@ -59,9 +59,11 @@ Your browser needs third-party cookies enabled to show the **Automate** tab in E
 - [Firefox](https://support.mozilla.org/kb/disable-third-party-cookies)
 - [Safari](https://support.apple.com/guide/safari/manage-cookies-and-website-data-sfri11471/mac)
 
-## Cross-platform API support
+## API support on older Excel versions
 
-Some Office Scripts APIs may not be supported by Excel for Windows or Excel for Mac, especially older builds. These include newer APIs and APIs for web-only features. If a script contains unsupported APIs, the Code Editor displays a warning. If you try to run such a script, it won't run and, instead, the **Script Run Status** task pane displays a warning message that says, "This script currently must be run on Excel for the web. Open the workbook in the browser then try again, or contact the script owner for help."
+Some Office Scripts APIs may not be supported by Excel for Windows or Excel for Mac, especially older builds. These include newer APIs and APIs for web-only features. If a script contains unsupported APIs, the Code Editor displays a warning. If you try to run such a script, it won't run. Instead, the **Script Run Status** task pane displays a warning message that says, "This script currently must be run on Excel for the web. Open the workbook in the browser then try again, or contact the script owner for help."
+
+Using an older version of Excel to open workbooks with scripts shared in them has no effect on the script itself.
 
 ## See also