Reduce the size of your mailbox a…
https://support.microsoft.com/en-us/office/reduce-the-size-of-your-mailbox-and-outlook-data-files-pst-and-ost-e4c6a4f1-d39c-47dc-a4fa-abe96dc8c7ef
Delete any items that you do not want to keep and empty the Deleted Items folder. Click File > Account Settings >Account Settings. On the Data Files tab, click the data file that you want to compact, and then click Settings. Click the Advanced tab > Outlook Data File Settings. In the Outlook Data File Settings dialog, click Compact ...
Delete any items that you do not want to keep and empty the Deleted Items folder.
Click File > Account Settings >Account Settings.
On the Data Files tab, click the data file that you want to compact, and then click Settings.
Click the Advanced tab > Outlook Data File Settings.
In the Outlook Data File Settings dialog, click Compact ...
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