返回 OlObjectClass 常量，指明该对象的类。只读。
| OlObjectClass 可以为以下 OlObjectClass 常量之一。 |
| olAction |
| olActions |
| olAddressEntries |
| olAddressEntry |
| olAddressList |
| olAddressLists |
| olApplication |
| olAppointment |
| olAttachment |
| olAttachments |
| olAutoFormatRule |
| olAutoFormatRules |
| olCalendarViewField |
| olCalendarViewFields |
| olCardViewField |
| olCardViewFields |
| olClassCalendarView |
| olClassCardView |
| olClassIconView |
| olClassTableView |
| olClassTimelineView |
| olContact |
| olDistributionList |
| olDocument |
| olException |
| olExceptions |
| olExplorer |
| olExplorers |
| olFolder |
| olFolders |
| olFormDescription |
| olIconViewField |
| olIconViewFields |
| olInspector |
| olInspectors |
| olItemProperties |
| olItemProperty |
| olItems |
| olJournal |
| olLink |
| olLinks |
| olMail |
| olMeetingCancellation |
| olMeetingRequest |
| olMeetingResponseNegative |
| olMeetingResponsePositive |
| olMeetingResponseTentative |
| olNamespace |
| olNote |
| olObjects |
| olOutlookBarGroup |
| olOutlookBarGroups |
| olOutlookBarPane |
| olOutlookBarShortcut |
| olOutlookBarShortcuts |
| olOutlookBarStorage |
| olPages |
| olPanes |
| olPost |
| olPropertyPages |
| olPropertyPageSite |
| olRecipient |
| olRecipients |
| olRecurrencePattern |
| olRemote |
| olReport |
| olResults |
| olSearch |
| olSelection |
| olSyncObject |
| olSyncObjects |
| olTableViewField |
| olTableViewFields |
| olTask |
| olTaskRequest |
| olTaskRequestAccept |
| olTaskRequestDecline |
| olTaskRequestUpdate |
| olTimelineViewField |
| olTimelineViewFields |
| olUserProperties |
| olUserProperty |
| olViews |
expression.Class
expression 必选。该表达式返回 Outlook 对象。