In order to reduce the amount of time that will be required to migrate your account from the old e-mail system and into the Office 365 system we recommend that you delete any e-mail messages from the old e-mail account that you do not need to keep.
Instructions provided here demonstrate how to remove old messages from the old e-mail system using a Web browser.
Navigate to the Webmail login page for Trojan E-mail. The link can be found on troy.edu or by typing https://mail.troy.edu directly into your browser's address bar. Then login to your account.
Select all e-mail in your inbox that you wish not to keep and then click the Delete option on the menu. To select an e-mail message simply check the box next to each e-mail message. Repeat this step for e-mail that is located in other folders, including your Sent items folder.
Empty/Clear all deleted e-mails that were sent to the Trash. Even though e-mails were deleted they will remain in your mailbox until the trash is emptied. Once you delete them from the trash folder there is no way to regain them.
Some users may have added additional folders that can be deleted. To delete an entire folder simply right-click on the folder listed in the left menu and from the context menu select "Delete Folder". Note that after deleting a folder it may be necessary to empty the trash bin again.