Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

The RETR command did not succeed. Error retrieving a messsage .Mail server outlook.office365.com responded:Server Unavailable.21

  • 2 replies
  • 11 have this problem
  • 34 views
  • Last reply by tarun.verma

srikanthkg19
srikanthkg19
more options

While opening thunder bird this below error " The RETR command did not succeed " coming so user not able to work please suggest



The RETR command did not succeed. Error retrieving a messsage .Mail server outlook.office365.com responded:Server Unavailable.21

While opening thunder bird this below error " The RETR command did not succeed " coming so user not able to work please suggest The RETR command did not succeed. Error retrieving a messsage .Mail server outlook.office365.com responded:Server Unavailable.21

All Replies (2)

david
david
  • Top 10 Contributor
more options

I think this is a server error. Try logging on to web account and check to see if any malformed messaged are there and delete them.

tarun.verma
tarun.verma
more options

The RETR command did not succeed. Error retrieving a message. Mail server outlook.office365.com responded: Server Unavailable. 21