Hello,

To develop an application using the API Microsoft GRAPH to import calendar events from an other corporate application (via data in an ICS file) and be able to update/delete them in the future,
i need to add a custom extended property on events and intend to use a “named” “single-value extended properties” as explained in extended properties overview , with a property identifiers in the 0x8000-0xfffe range as in the example :

“{type} {guid} Name {name}” “String {8ECCC264-6880-4EBE-992F-8888D2EEAA1D} Name TestProperty” Identifies a property by the namespace (the GUID) it belongs to, and a string name.

The MAPI Property Identifier Overview states that :

Beyond 0x8000 is the range for what is known as named properties, or properties that include a 128-bit globally unique identifier (GUID) and either a Unicode character string or 32-bit numeric value. Clients can use named properties to customize their property set

As a new developper in Office365 environment, the GUID generation and its scope in office365 are not quite clear to me :

Does it means that we are free to use any 128-bit GUID/Namespace in the 0x8000 range to set a custom named property ?What is the scope of the GUID/namespace in that context ? Is it limited to my graph client application or shared with others ?Even if the conflict risk looks weak, is there a method to check/generate my GUID ? or to get some GUIDs already used somewhere that could collide with the one i am using ?

Regards,

​Hello, To develop an application using the API Microsoft GRAPH to import calendar events from an other corporate application (via data in an ICS file) and be able to update/delete them in the future,i need to add a custom extended property on events and intend to use a “named” “single-value extended properties” as explained in extended properties overview , with a property identifiers in the 0x8000-0xfffe range as in the example :”{type} {guid} Name {name}” “String {8ECCC264-6880-4EBE-992F-8888D2EEAA1D} Name TestProperty” Identifies a property by the namespace (the GUID) it belongs to, and a string name.The MAPI Property Identifier Overview states that :Beyond 0x8000 is the range for what is known as named properties, or properties that include a 128-bit globally unique identifier (GUID) and either a Unicode character string or 32-bit numeric value. Clients can use named properties to customize their property set As a new developper in Office365 environment, the GUID generation and its scope in office365 are not quite clear to me :Does it means that we are free to use any 128-bit GUID/Namespace in the 0x8000 range to set a custom named property ?What is the scope of the GUID/namespace in that context ? Is it limited to my graph client application or shared with others ?Even if the conflict risk looks weak, is there a method to check/generate my GUID ? or to get some GUIDs already used somewhere that could collide with the one i am using ? Regards,  Read More

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