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The most recent version of MS Outlook along with Word, Excel, and PowerPoint are included in Office for Mac 2011.

As in the earlier versions, Outlook 2011 is primarily used as an email sending and receiving application.

However, it also manages email data, such as contacts, calendar, tasks, and notes that are stored in an archive with.olm extension (.pst in windows).

However, if you have been sending and receiving emails earlier using the same authentication details, the issue could be with the outlook database (.olm) file.

For example, it might have suffered from corruption.

However, if you cannot get the OLM file repaired, consider the following methods to resolve the issue.

However, if authentication details are correct, then proceed with the next step.

Choose your email account and click More Options button beneath the Outgoing Server.

If you face any issue with the database, repair OLM file using Stellar Repair for OLM whenever required.

Having 10 years of experience in different technologies including, Office Systems, Exchange Server, Mac Technology, and Open Source email server platform.

I was using Gmail and Imap for my account in Outlook for Mac 2011.

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Outlook For Mac Authentication Failed