Step 5: Based on the Archive settings, you can run the AutoArchive feature. Step 4: Next, choose from the following options to find the items you want to delete to cleanup mailbox size:ġ) Select ‘Find Items Older Than’ to search for items older than a certain period of timeĢ) Select ‘Find Items Larger Than’ to search for items larger than a certain size Step 3: In the Mailbox Cleanup dialog box that pops-up, click View Mailbox Size to confirm the size of your mailbox and the size of each subfolder.

To use the Mailbox Cleanup utility, follow these steps: The utility helps track mail messages based on different criteria, and allows you to decide which ones to delete. The best way to start reducing your Outlook PST file size is to open Mailbox Cleanup utility. Let’s look at some recommended ways that can reduce the size of your large-sized PST file, which in turn, helps improve Outlook’s performance:ġ.

How can you deal with Outlook slow loading issue?

Also, an oversized PST file can become damaged, causing Outlook to respond slowly and eventually crash at some point How a Large-sized PST file causes Outlook slow loading issue?Ī large number of messages with too many attachments can cause Outlook to load slowly, as larger files can take longer to write on the disk.