AutoArchive feature can help users to automatically move or permanently delete all messages or calendar entries older than specified days/weeks/months easily in Microsoft Outlook. And you can do as following:

1. Select the folder that you will remove items older than specified days/weeks/months, right click and select the Properties from the drop down list.

2. In the coming Properties dialog box, go to the AutoArchive tab, and there are two situations:

A: If the option of Archive this folder using these settings is checked
This means you archive this folder with custom settings. Find out the Clean out items older than, then specify the older than period, such as 6 months, next check the option of Permanently delete old items.

B: If the option of Archive items in this folder using the default settings is checked
Click the Default Archive Settings button; then in the AutoArchive dialog box, specify the older than period behind the Clean out items older than, and check the option of Permanently delete old items.

3. Click the OK button(s) to close dialog box(es).

After configuring, it will automatically delete messages or calendar entries older than the specified period in Outlook.

Quickly search and delete duplicate emails in Outlook

>With Kutools for Outlook’s Duplicate Emails feature, you can quickly find and delete them from multiple mail folders, or find and delete all duplicates from the selected ones with two clicks in Outlook.

To delete all messages older than the specified days/weeks/months in Outlook, you can also apply the New Search Folder feature to find out all old messages, and then delete them easily.

1. Select the mail folder where you will remove messages older than specified period.

2. Click the New Search Folder button on the Folder tab. (Note: In Outlook 2007, you can click the File > New > Search Folder.)

3. In the New Search Folder dialog box, click to select the Old mail in the Organizing Mail section, and then click the Choose button.

4. In the coming Old Mail dialog box, specify the older than period in the two boxes, and then click the two OK buttons to close two dialog boxes.

5. Find out and select the new search folder in the Navigation Pane, select all messages in this search folder with pressing the Ctrl + A keys at the same time, and then delete all of them with pressing the Delete key.