
Disable the ability to create tentative appointments
Note: this will stop Outlook and Exchange from creating tentative appointments on the calendar automatically, however, the tentative appointment will be created at the time you select the meeting request in your Inbox. Exchange Server 2013 The administrator can use this cmdlet to prevent tentative appointments meeting requests received from users outside of your network.
Meetings are not removed when the invitation is deleted
When a meeting invitation is deleted from the Inbox, the tentative copy of the associated meeting remains in the Calendar.

Outlook Quick Tip: Missing Calendar Bell
Several users who recently upgraded to Outlook 2010 or Outlook 2013 wondered what happened to the reminder bell: The Calendar reminder bell is not displayed on the month view. It's on the other views. How do I turn it on for the month view? Microsoft turned off the bell to give a cleaner appearance. You

New Appointments are saved in the wrong calendar
When you use an IMAP account in Outlook 2013, appointments and contacts are stored in the IMAP data file. Create a local pst file and move the appointments and contacts to the local data file.
Outlook Meetings disappear from the Calendar
Meeting disappear from Outlook's calendar as soon as they are added to it.
Recurring meeting every two weeks skips the first week
When you create a recurring appointment or meeting in Microsoft Outlook for every 2 weeks or more, Outlook begins counting "this week", even if the day is past.
Keep Canceled Meetings on Outlook's Calendar
There are two methods you can use to keep canceled meetings on your calendar: keep the cancellation notice or use a Run a Script rule to create an appointment using using the meeting details. Code sample included.

To change the hourly interval in Outlook
Outlook's calendar supports multiple time scales, from 5 minutes to 1 hour. While you can't make your own interval, you can change the scale to one more suitable for your needs.
Move meetings without losing the ability to "Send Update"
When you migrate meetings from an Outlook mailbox or PST file to another Mailbox or PST file, you will be missing the "Send Update" option.

Add Holidays to Outlook's Calendar
Create a Custom Holiday File (HOL) to share any type of all day event with other Outlook users. We include a sample file that counts the days since Jan1 and the number of days left in the year.

