You can delete some or all of these messages or move them to another Outlook Data File (.pst). This will find all messages larger than 5 MB. Click in the Search box and type: messagesize:>5 mb. You can search for all messages larger than a specific size from Outlook's Search box. For more information, see Use Conversation Clean Up to delete redundant messages. Conversation Clean Up can remove those redundant messages automatically. In a long email thread, there are often numerous messages that contain all of the same information as prior messages. Use Conversation Clean Up to remove redundant messages Select View Mailbox Size, Find items older than, Find items larger than, View Deleted Items Size, Empty Deleted Items folder, View Conflicts Size, or Empty Conflicts to perform your desired task. The Mailbox Cleanup tool can delete these conflicts for you. Conflicts happen when a copy of an item stored on your email server is out of sync with a copy of an item stored on your local computer.
Occasionally, Outlook will store conflicted items in a folder called Conflicts. The tool provides a button to view the size of your Deleted Items folder and empty your Deleted Items folder. Often, the cause of a large mailbox is a large Deleted Items folder. This tool can also help you search for older or very large messages that you might want to delete or move to an Outlook Data File (.pst). You can use the Mailbox Cleanup tool to view the size of your mailbox and individual folders. There are several ways to reduce your mailbox size.
OUTLOOK OST FILE LOCATION WINDOWS 7 HOW TO
To reduce the size of your Outlook Data File (.pst) or Offline Outlook Data File (.ost), you can manually compact the data file. Select your version of Outlook below to see instructions on how to reduce the size of a. If you use an Microsoft 365, Exchange, IMAP, or account, a copy of your mailbox is stored in an Offline Outlook Data File (.ost). Note: If you use a POP account, all of your email account information, including your folders, email messages, contacts, calendar, and task information is stored in an Outlook Data File (.pst). If you receive a message that your mailbox is over its size limit, deleting messages and folders can help, but if you store your information in an Outlook Data File (.pst) or Offline Outlook Data File (.ost), that data file may not shrink in size automatically. Large mailboxes can take longer to open and search, and many email providers, including Microsoft 365, limit the maximum size of your mailbox. I wanted to move existing OST files and this key only applies to new profiles, if you have large mailboxes, rules etc it is preferential to move the OST file rather than delete the account and add it back. The more email you send and receive, the larger your Outlook mailbox can grow. This registry key, HKCU:\Software\Microsoft\Office\16.0\Outlook\ForceOSTFiles, does nor actually solve the problem I was fixing. Outlook for Microsoft 365 Outlook 2021 Outlook 2019 Outlook 2016 Outlook 2013 Outlook 2010 Outlook 2007 More.