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It was the autodiscover. I removed the 443 binding on old server and seem to have fixed issue.<br />
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Thank you for pointing me in correct direction.
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It was the autodiscover. I removed the 443 binding on old server and seem to have fixed issue.

Thank you for pointing me in correct direction.

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Migrated to hosted exchange. Now users get a Security Alert when logging into there outlook clients. <br />
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The Security certificate is invalid but is pointing to the old certificate that had expired.
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Migrated to hosted exchange. Now users get a Security Alert when logging into there outlook clients. 

The Security certificate is invalid but is pointing to the old certificate that had expired.

Issue with Exchange Security Certificate

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.