Hello,

I have just about every user experiencing an issue with Outlook 2010 where Outlook keeps prompting for credentials.  This has been happening ever since recent Microsoft Office updates that rolled out last week it seems. All my users still have connection to the exchange server and can send/reply just fine.  Issue occurs on both 32 bit and 64bit versions.  This prompt will appear every few seconds and is becoming a nuisance for all my users. 

I have attempted the following with no resolution:

- removed credentials from credentials manager

- ran Outlook in safe mode

- ran repairs on Office

- completely removed and re-added users Outlook profile (profiles are manually configured)

- made sure Office is up to date

- configured Outlook account on freshly imaged PC

• Edited by Joshua Slocum Friday, February 20, 2015 5:56 PM

Hi,

For this issue, you can first try some suggestions in this forum content:

Why does Outlook keep prompting for password

Especially try NTLM Authentication to check the result.

We have received some report about this issue since the February 10, 2015 update for Outlook 2010 (KB2956128). If you have installed this update, please note we have realized this issue and once there is any update, I'll let you know.

Regards,

Melon Chen
TechNet Community Support