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How to Fix Mac Outlook Error 19991?

This Outlook error generally arises with users who are working with Mac devices but can also occur in other operating systems.Reasons being are virus infection or may be due to internet dis-connectivity problems. While this error occurs, users won’t be able to send or receive any kind of files. So it is quite compulsory to Fix Mac Outlook Error 19991 with appropriate steps. there are also other reasons such as the problem occurs while closing, downloading, installing, launching, updating, sending, receiving, copying, pasting files. File corruption is also known to be the consequence of this issue.Corrupted PST files, incorrect account settings, malfunctioning of operating systems, Oversize issue of Outlook data file, low system memory are few causes of this error to execute.

Steps to Fix Mac Outlook Error 19991

Top signs Outlook error 19991 are as follows:

  • Unable to send any messages
  • This Outlook error will prohibit users from working with their files or mails
  • It will permit users to send or receive any type of messages
  • System slow down problems
  • Problems whilesystem start-up
  • Blue screen error and computer freezing issues.
  • Crashing of the Outlook application
Related Blog- How to Fix Mac Outlook Error 150?

Steps to fix Outlook error 19991

To fix Outlook error 19991, users are advised by Outlook Help professionals to follow below instructions carefully:

  • First of all do ensure that you are well connected with the internet or web.
  • Now navigate to the Outbox of the email and then, delete all of the mails from there.
  • You have to re-enter your username as well as password in your account.
  • At last, users will have to close the window and then, restart the Mac.

By working on the above manual guidelines, I hope you will be able to fix this issue easily.But sometimes, you still may have issues. So, in that case, proceed us at below contact details.

Get connected to our technical team at Outlook Customer Care Number for immediate results


We bring quality solutions at your desk that are available at Outlook Customer Support Number +1-855-465-0984 to users whenever in need. Our team can be reachable anytime to assist you with the best possible results. So connect us now and get your issues fixed up immediately.