The limit of contacts on Google *should* be 10,000 but I've heard that
number is just an estimate. In any case 4500 should be below the
limit. If you're working from a single 'master' contact list you
could try using one of the 'Replace ... with ...' strategies. These
will produce a more predictable number of contacts to make sure you
don't have more than you think you do.
Jeff
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Jeff Nichols
Wateree Software
http://wateree.net/