OIT Home > OIT Knowledge Base Search Knowledge Base: How long are deleted items retained? Office 365 and Gmail have different email retention policies for the Deleted Items (Trash) folders and mail that has been permanently deleted. When you delete a message using Outlook, the Outlook Web App, or the Gmail Web App, messages are moved to either your Deleted Items folder or your Trash folder. Office 365: Messages are NOT automatically purged from your Deleted Items folders. Once you permanently deleted messages from this folder, it can be recovered for up to 14 days through the Recover Mailbox Tool within Outlook and the Outlook Web App. Outlook 2010/2016 for Windows Outlook 2016 for Mac Outlook on the Web Gmail (Students only): Messages ARE automatically purged from your Trash folders. Messages that have been in Trash more than 30 days will be automatically deleted. Once a message has been permanently deleted, it cannot be recovered. If you would like more information about your storage options, please call the OIT HelpDesk at (865) 974-9900. Need more help?