exchangelib: folder:UnreadCount not supported on Exchange 2010?

Hi ecederstrand,

I’m trying to access the calendar of my account. I was able to get the calendar items through account.root,get_folder_by_name(‘Calendar’). But when I tried to directly pull the calendar view to get availability at a certain time. It returned error as below. Wondering if you know what is the reason for that. Really appreciate it!

Thank you so much!

Traceback (most recent call last)
C:\ProgramData\Anaconda\lib\site-packages\cached_property.py in __get__(self, obj, cls)
     49                 # check if the value was computed before the lock was acquired
---> 50                 return obj_dict[name]
     51             except KeyError:

KeyError: 'calendar'

During handling of the above exception, another exception occurred:

ErrorInvalidPropertyRequest               Traceback (most recent call last)
<ipython-input-45-8bf1ed0c630e> in <module>()
      2 start_dt = ts.localize(EWSDateTime(2018, 3,1,14,0)),
      3 end_dt = ts.localize(EWSDateTime(2018, 3, 1,14,30))
----> 4 account.calendar.view(start=start_dt, end=end_dt)

C:\ProgramData\Anaconda\lib\site-packages\cached_property.py in __get__(self, obj, cls)
     51             except KeyError:
     52                 # if not, do the calculation and release the lock
---> 53                 return obj_dict.setdefault(name, self.func(obj))
     54 
     55 

C:\ProgramData\Anaconda\lib\site-packages\exchangelib\account.py in calendar(self)
    149         # Attempt not to return one of those. An account may not always have a calendar called "Calendar", but a
    150         # Calendar folder with a localized name instead. Return that, if it's available.
--> 151         return self.root.get_default_folder(Calendar)
    152 
    153     @threaded_cached_property

C:\ProgramData\Anaconda\lib\site-packages\exchangelib\folders.py in get_default_folder(self, folder_cls)
    735             # Get the default folder
    736             log.debug('Testing default %s folder with GetFolder', folder_cls)
--> 737             f = folder_cls.get_distinguished(account=self.account)
    738             return self._folders_map.get(f.folder_id, f)  # Use cached instance if available
    739         except ErrorAccessDenied:

C:\ProgramData\Anaconda\lib\site-packages\exchangelib\folders.py in get_distinguished(cls, account)
    619     def get_distinguished(cls, account):
    620         assert cls.DISTINGUISHED_FOLDER_ID
--> 621         folders = list(cls.get_folders(account=account, ids=[cls(account=account, name=cls.DISTINGUISHED_FOLDER_ID)]))
    622         if not folders:
    623             raise ErrorFolderNotFound('Could not find distinguished folder %s' % cls.DISTINGUISHED_FOLDER_ID)

C:\ProgramData\Anaconda\lib\site-packages\exchangelib\folders.py in get_folders(cls, account, ids, additional_fields)
    610                 folders=ids,
    611                 additional_fields=additional_fields,
--> 612                 shape=IdOnly
    613         ):
    614             if isinstance(elem, Exception):

C:\ProgramData\Anaconda\lib\site-packages\exchangelib\services.py in _get_elements_in_response(self, response)
    281         for msg in response:
    282             assert isinstance(msg, ElementType)
--> 283             container_or_exc = self._get_element_container(message=msg, name=self.element_container_name)
    284             if isinstance(container_or_exc, ElementType):
    285                 for c in self._get_elements_in_container(container=container_or_exc):

C:\ProgramData\Anaconda\lib\site-packages\exchangelib\services.py in _get_element_container(self, message, name)
    254         # rspclass == 'Error', or 'Success' and not 'NoError'
    255         try:
--> 256             self._raise_errors(code=response_code, text=msg_text, msg_xml=msg_xml)
    257         except self.ERRORS_TO_CATCH_IN_RESPONSE as e:
    258             return e

C:\ProgramData\Anaconda\lib\site-packages\exchangelib\services.py in _raise_errors(cls, code, text, msg_xml)
    271         try:
    272             # Raise the error corresponding to the ResponseCode
--> 273             raise vars(errors)[code](text)
    274         except KeyError:
    275             # Should not happen

ErrorInvalidPropertyRequest: Property is not valid for this object type. (field: <ns0:FieldURI xmlns:ns0="http://schemas.microsoft.com/exchange/services/2006/types" FieldURI="folder:UnreadCount" />)