Contacts disappear

If your contacts were saved in your corporate mail account, and they did not transfer them to the new account, once you signed out of the Lotus account, they would have been lost from your iPhone. They are not stored locally, they were synced from the corporate mail account, and it was removed. Contact your Exchange administrator for assistance.

iPhone contacts are part of an email account that you had added; Google, AOL, iCloud, Exchange, Yahoo or any other

Add the account and contacts will be back.