Cannot send to a group of contacts in Outlook 2010 (came from Outlook 2007 and imported contacts on a new laptop)

I cannot send to a group of contacts in Outlook 2010 (came from Outlook 2007 and imported contacts on a new laptop)... Can't find much online when I look up the error... I've already tried to recreate a user profile and redone the settings manually, which yielded nothing. When I send to the list of 1600 contacts (in the BCC field) it gives the following error:

Outlook-error.png
AmoayedAsked:
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AmoayedConnect With a Mentor Author Commented:
I saved it as a draft and opened in outlook web access (i.e., owa.site.com); there, it identified approx. 20 contacts that were conflicting. I removed those and it sent out fine... Thanks for the attempts...
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madhatter5501Commented:
is this only on one computer that you are having the problem, or is it from multiple machines or all machines
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AmoayedAuthor Commented:
One laptop, not all machines. Our exchange server is hosted by an off-site company.
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madhatter5501Commented:
if it is only that machine then at least we know the scope of the issue and need to focus on the one machine
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AmoayedAuthor Commented:
Yes, I figured that much.
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madhatter5501Commented:
what if you create a new distro group in the hosted exchange, can you send to that group?
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AmoayedAuthor Commented:
The group I'm referring to is just a bunch of individual emails, not an actual Outlook Dist Group.
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Jeff PerkinsOwnerCommented:
I had the same issue when upgrading my Outlook 2007 to 2010, I had to recreate all of the groups in 2010. The regular contacts were fine, but the groups I had created in previous version would not migrate.
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AmoayedAuthor Commented:
I've removed the groups in the BCC list and it still yields the same error. Any additional ideas?
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AmoayedAuthor Commented:
I solved it by myself...
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