Have you ever received an email from your Messaging Administrator, telling you that your mailbox size is exceeding its limits? Or have you noticed that your Outlook is booting and working a bit slower every month? Well we all learned how to (auto) archive emails, delete old mails and keep our mailbox tidy and clean. But did you know that you Calendar can eat up lots of space as well? When you use your outlook over several months old appointments will still remain in the calendar file, including all attachments and pictures. This can turn into a real nightmare but fear no longer: here are a few tips on how to free your calendar.
(1) In your Outlook Calendar click on View > Current View > By Category

(2) Delete old Events
You can sort the upcoming list by date and delete old appointments. Depending on how long you’ve been using Outlook these entries might reach long into the past. Be careful not to delete recurring events as you might kill the entire series.
(3) Delete “big” appointments
This list doesn’t display the size of appointments by default, but you can easily add the Size field to the top of the table.

Right click on one of the header fields (”Subject”, “Location” etc.) and click on Customize Current View. In the upcoming Window click on Fields.
(4) Select Size and click on the Add -> Button

(5) Sort the list by Size and delete large attachments.

Voilà thats it, you’re done.
Bonus Tip:
There is actually another method to find large appointments in the Calendar.
- In your Outlook Calendar menu, click on Tools, select Find, then Advanced Find.
- 2. On the More Choices tab, at the bottom under Size, select the greater than option
- 3. Input the maximum amount you want to see, for example 100.