These articles are in the Developer and Code Sample categories. These pages often contain only the code, with very little instructions and assume the reader has some VBA knowledge. See How to use the VBA Editor if you need help using VBA.
Additional code samples are at VBA Code Samples
Set a reminder when accepting a meeting request
Use VBA to open an Outlook meeting request that was just added to the calendar after accepting the request in the Inbox. so you can set a reminder or make notes.
Dismiss reminders for past calendar events
Two macros to remove reminder from appointments. The first macro removes the reminders as the appointment is created in a specific calendar folder. The other macro removes reminders from older items.

Automatically block off time before and after meetings
Use a macro to automatically add travel time to new meetings on your Outlook calendar.

Foward a Message and CC the Original Recipients
A visitor to the Microsoft Answers forum asked about forwarding a message and automatically CCing it to the original recipients.
Add Attachments and Set Email Fields During a Mail Merge
Use an ItemSend macro to set fields on email merges and include attachments.

Import meetings from a CSV or XLSX file
Use a macro to import data from a CSV or Excel xlsx file to create meeting requests or appointments.

Select Multiple Calendars in Outlook
Use VBA to select multiple calendars in overlay mode. Can deselect iCloud calendars using this code. Code Sample included.
Use a Default Subject for New Messages
How to use a VBA macro to insert a predefined text into the subject field of a new messages. Method works with any Outlook item type.

Save email message as text file
Use an Outlook macro to save the selected message as a text file, or save the selected messages in a single text file.

Merge or Split Conversations
A major complaint about Outlook's conversation view is the inability to split and merge conversations. While Outlook doesn't offer the capability, you can use a macro to merge or split conversations.
List Snoozed Reminders
A user wanted to know how to view his snoozed reminders: Say I have task and set it to postpone, for instance, 4 days. Is there a column that I can select that will show this postponed date? You can make a list of snoozed reminders using this macro Sub FindSnoozedReminders() Dim objReminder As Outlook.Reminder

Automatically create a task when sending a message
How to automatically create tasks for message you send using a VBA macro.

Forward Messages that were not Replied To
Use a macro to forward Outlook email messages that are waiting for a reply after a number of days.

Import Messages from File System into Outlook Folders
This macro uses the OpenSharedItem method to import messages, appointments, or contacts stored in the Windows File System back into Outlook folders.

Change Item Count on All Folders in a Data File
Use a macro to change the Outlook option to show either the number of unread messages or the total number of messages in a folder.