outlook client issues

ok i am currently using exchange 2010 and exchange 2003. Users have issues when sending emails to certain users.
The error is
IMCEAEX-_O=abc_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+54FYDIBOHF90SPDLT+78_CN=RECIPIENTS_CN=x+y@iyz.com
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

What do i have to do to solve this issue? Add x500 address. can i do this in bulk if so how?

Also how can i clear outlook address book and set global address book as the default. Also need to clear Outlook 2007/2010/2013 Auto-Complete Cache
Member_2_6474242Senior Systems AdministratorAsked:
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mbkitmgrCommented:
Areyou using SMTP as the primary email protocol?
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Alexandre MichelManager; IT ConsultantCommented:
Have you recently migrated to a new server?
In either case ask the user to do as follow
  1. Start a new email
  2. Start typing a name (i.e. Joh)
  3. Delete the cached email by pressing the big X at the end of the name
  4. Retype the full email
  5. Send the email

Does hat fix your problem?
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Todd NelsonSystems EngineerCommented:
What do i have to do to solve this issue? Add x500 address. can i do this in bulk if so how?

Take a look at this article.  I know it refers to O365 but it is applicable.  https://oddytee.wordpress.com/2014/08/22/imceaex-ndrs-after-migrating-psts-to-office-365/


Also how can i clear outlook address book and set global address book as the default

Set the Default OAB on each mailbox database.
https://support.office.com/en-us/article/Change-the-default-Address-Book-84c7be39-282a-4096-aeb8-89a2661a5162


Also need to clear Outlook 2007/2010/2013 Auto-Complete Cache

https://lookeen.com/blog/how-to-clear-the-auto-complete-cache-in-outlook
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Member_2_6474242Senior Systems AdministratorAuthor Commented:
There are a bulk of users that have this issue. what can i do to solve all of it in one shot. can all of the above be done in bulk

mbkitmgr yes we are using smtp as the primary email protocol
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Member_2_6474242Senior Systems AdministratorAuthor Commented:
thanks
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