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What root certificate is the site using. It is probably missing or out of date on your computer. <br />
<br />
1. Open IE and go to the OWA page<br />
2. Select File, Properties, Certificate<br />
3. Select Certification Path<br />
4. Select top level certificate in path and click Install.<br />
5. Repeat for any intermediate certificates.<br />
<br />
Then try Outlook again.
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What root certificate is the site using. It is probably missing or out of date on your computer.

1. Open IE and go to the OWA page
2. Select File, Properties, Certificate
3. Select Certification Path
4. Select top level certificate in path and click Install.
5. Repeat for any intermediate certificates.

Then try Outlook again.

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certificate problem update your phone
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I can not connect to exchange 2007 server from a computer using a 4G internet connection using outlook anyware in outlook 2013. It complains about the security certificate is invalid.<br />
<br />
But I can use the same exchange email account from my Apple IPad and it works well.<br />
<br />
Can I use an older version of outlook or do they all require a valid security certificate?
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I can not connect to exchange 2007 server from a computer using a 4G internet connection using outlook anyware in outlook 2013. It complains about the security certificate is invalid.

But I can use the same exchange email account from my Apple IPad and it works well.

Can I use an older version of outlook or do they all require a valid security certificate?

outlook anyware

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

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.