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 17 hours 55 minutes ago

Hi Joshua..

Same discussion.. Check out the forum hope it will be helpful for you

https://social.technet.microsoft.com/Forums/exchange/en-US/aa84ccc3-a3e4-4f90-ba98-b2bcb645afcf/outlook-2010-keeps-prompting-for-exchange-server-password

Thanks

Joe