protected override void InternalSave(ConfigurableObject instance)
        {
            if (instance == null)
            {
                throw new ArgumentNullException("instance");
            }
            MailboxCalendarFolder mailboxCalendarFolder = instance as MailboxCalendarFolder;

            if (mailboxCalendarFolder == null)
            {
                throw new NotSupportedException("Save: " + instance.GetType().FullName);
            }
            if (mailboxCalendarFolder.PublishEnabled)
            {
                SharingPolicy sharingPolicy = DirectoryHelper.ReadSharingPolicy(base.MailboxSession.MailboxOwner.MailboxInfo.MailboxGuid, base.MailboxSession.MailboxOwner.MailboxInfo.IsArchive, base.MailboxSession.GetADRecipientSession(true, ConsistencyMode.IgnoreInvalid));
                if (sharingPolicy == null || !sharingPolicy.Enabled || !sharingPolicy.IsAllowedForAnonymousCalendarSharing())
                {
                    throw new NotAllowedPublishingByPolicyException();
                }
                SharingPolicyAction allowedForAnonymousCalendarSharing = sharingPolicy.GetAllowedForAnonymousCalendarSharing();
                int maxAllowed = PolicyAllowedDetailLevel.GetMaxAllowed(allowedForAnonymousCalendarSharing);
                if (mailboxCalendarFolder.DetailLevel > (DetailLevelEnumType)maxAllowed)
                {
                    throw new NotAllowedPublishingByPolicyException(mailboxCalendarFolder.DetailLevel, (DetailLevelEnumType)maxAllowed);
                }
            }
            MailboxFolderId mailboxFolderId = mailboxCalendarFolder.MailboxFolderId;
            StoreObjectId   folderId        = mailboxFolderId.StoreObjectIdValue ?? base.ResolveStoreObjectIdFromFolderPath(mailboxFolderId.MailboxFolderPath);

            if (folderId == null || folderId.ObjectType != StoreObjectType.CalendarFolder)
            {
                throw new CantFindCalendarFolderException(mailboxFolderId);
            }
            using (CalendarFolder calendarFolder = CalendarFolder.Bind(base.MailboxSession, folderId))
            {
                ExtendedFolderFlags?valueAsNullable = calendarFolder.GetValueAsNullable <ExtendedFolderFlags>(FolderSchema.ExtendedFolderFlags);
                if (valueAsNullable != null && (valueAsNullable.Value & ExtendedFolderFlags.PersonalShare) != (ExtendedFolderFlags)0)
                {
                    throw new CannotShareFolderException(ServerStrings.CannotShareOtherPersonalFolder);
                }
                this.SaveSharingAnonymous(mailboxCalendarFolder, folderId);
                if (!mailboxCalendarFolder.PublishEnabled)
                {
                    mailboxCalendarFolder.PublishedCalendarUrl = null;
                    mailboxCalendarFolder.PublishedICalUrl     = null;
                }
                UserConfigurationDictionaryHelper.Save(mailboxCalendarFolder, MailboxCalendarFolder.CalendarFolderConfigurationProperties, (bool createIfNonexisting) => UserConfigurationHelper.GetPublishingConfiguration(this.MailboxSession, folderId, createIfNonexisting));
                if (MailboxCalendarFolderDataProvider.UpdateExtendedFolderFlags(mailboxCalendarFolder, calendarFolder))
                {
                    calendarFolder.Save();
                }
            }
        }