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Why does Exchange 2000 by default set the maximum Recipients to 5000, but Outlook 2000 or 2003 can only send 29KB in the To: or Bcc: field?

Felix Toledo
Felix Toledo asked
Medium Priority
Last Modified: 2007-12-19
We have Exchange 2000 server, the clients mostly have Outlook 2000, a few have Outlook 2003.
I need to know how many people I can paste into the To or BCC field?
Microsoft says that a distribution list can only be 29KB (about 150 contacts) and that the workaround is the make a DL with nested DLs in it.
I have heard varying answers which have me confused.  I'm looking for a defintive answer.  

500 points to whomever can give me a clear solution.
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Expert of the Year 2007
Expert of the Year 2006
What you are confusing is distribution lists and recipients.

Outlook can manage to hold around 150 contacts in a distribution list. That is a stored distribution list used time and time again.
However if you create nested distribution lists then you could potentially have 22,500 contacts. That would be 150 lists, or 150 contacts. Keep on nesting and you could have millions of recipients.

There is no limit to the number of contacts that you can paste in to Outlook as a one off message. I wouldn't dream of pasting a large distribution list in the To: line as the headers alone will be massive and it would be seen to be very impolite.


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Felix ToledoDirector, IT Americas


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