Please follow below steps to create a search folder and collect all emails received in last 2 weeks or recent 14 days in Outlook.

1. In the Mail view, select the email account you will create the search folder in, and click Folder > New Search Folder. See screenshot:

2. In the New Search Folder dialog box, click to highlight the Create a custom Search Folder option, and click the Choose button.

3. Now the Custom Search Folder dialog box opens. Type a name for the new search folder in the Name box, and click the Criteria button. See screenshot:

4. In the new opening Search Folder Criteria dialog box, go to the Advanced tab, and:

(1) Click Field > Date/Time fields > Received;
(2) Select on or after from the Condition drop down list;
(3) Type 2 weeks ago or 14 days ago into the Value box;
(4) Click the Add to List button.

5. Click the OK buttons to close all dialog boxes.

And now it creates a search folder will all emails received in last 2 weeks (or recent 14 days) in Outlook.

Create search folder by uncategorized or two/multiple categories in Outlook

Create a search folder excluding folders (Delete Items, RSS, etc.) in Outlook

Create a search folder by a specific email domain name in Outlook

Create a search folder by dynamic date range in Outlook

Create a search folder across multiple Outlook data files/pst/email accounts