User is experiencing an error in Outlook when replying to all users, that states "Could not complete the operation. one or more parameter values are not valid"

User is experiencing an error in Outlook when replying to all users, that states "Could not complete the operation. one or more parameter values are not valid"  This seems to happen when replying to an email with the REPLY ALL button, but not sure if this is coincidental.  We have rebooted the Exchange 2010 server to make sure its not some type of glitch.
Damian GardnerIT AdminAsked:
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Wilder1626Commented:
Hi

Have you tried to delete all the cached email addresses? This may resolve the problem.

You can do this manually by typing the first letter in the To or CC field, and then delete all the email address in the cache.

You can also clear everything by following this procedure:
Go into File, Option, Mail, Uncheck Use Auto-Complete List... and then click on Empty Auto-Complete List
clear
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Damian GardnerIT AdminAuthor Commented:
No.  I'll have the user try this.  thank you
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Damian GardnerIT AdminAuthor Commented:
this worked.  thank you!
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Wilder1626Commented:
I'm glad i was able to help
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