Persisting State
There are a number of ways you can persist the state and settings.
| Settings | Excel API |
| saved in the workbook | |
| Shared API (Word and PowerPoint) | |
| saved in the document or presentation | |
| uses name/value pairs in a property bag | |
| RoamingSettings | Shared API (Outlook) |
| saved in the users server mailbox | |
| only available to the add-in that created them and only from the users mailbox where the add-in is installed. | |
| uses name/value pairs in a property bag | |
| CustomProperties | Excel API |
| saved in the workbook | |
| Shared API (Outlook) | |
| saved in the message, appointment or meeting | |
| only available to the add-in that created them | |
| uses name/value pairs in a property bag | |
| CustomXmlPart | Excel API |
| saved in the Excel workbook | |
| also has CustomXmlPartCollection | |
| CustomXmlParts | Shared API (Word and PowerPoint) |
| saved in the document or presentation | |
| only available to the add-in that created them | |
| HTML5 Storage | Uses browser control storage |
| cookies, localStorage, sessionsStorage |
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